As filed with the Securities and Exchange Commission on April 9, 1997
                                                   Registration No. 333-

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                 --------------

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                                  ------------

                           IRON MOUNTAIN INCORPORATED
               (Exact name of issuer as specified in its charter)

        Delaware                                               04-3107342
(State or other jurisdiction of                              (I.R.S. Employer
incorporation or organization)                              Identification No.)


                745 Atlantic Avenue, Boston, Massachusetts 02111
                                 (617) 357-4455
           (Address of Principal Executive Offices including zip code)
                                  -------------

              Iron Mountain Incorporated 1995 Stock Incentive Plan
                            (Full titles of the plan)
                                  ------------

                                C. Richard Reese
                            Chairman of The Board of
                     Directors and Chief Executive Officer
                           Iron Mountain Incorporated
                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
                                 (617) 357-4455
            (Name, address and telephone number of agent for service)
                                  -------------

                                    Copy to:
                             William J. Curry, Esq.
                            Sullivan & Worcester LLP
                             One Post Office Square
                           Boston, Massachusetts 02109
                                 (617) 338-2800
                                ----------------

<PAGE>


                                 ---------------
<TABLE>
<CAPTION>

                         CALCULATION OF REGISTRATION FEE


                                                     Proposed            Proposed Maximum  
  Title of Securities         Amount to be       Maximum Offering            Aggregate            Amount of
   to be Registered            Registered       Price Per Share(1)       Offering Price(1)     Registration Fee
   ----------------            ----------       ------------------       -----------------     ----------------
<S>                            <C>                    <C>                <C>                     <C>

Common Stock, par
value $.01 per share             231,667               $  6.48             $ 1,501,202.16         $   454.91
Common Stock, par                                                                                 
value $.01 per share              77,177               $ 12.58             $   970,886.66         $   294.21
Common Stock, par                                                                                 
value $.01 per share              65,152               $ 16.12             $ 1,050,576.00         $   318.36
Common Stock, par                                                                                 
value $.01 per share             355,152               $ 15.37             $ 5,460,462.00         $ 1,654.69
Common Stock, par                                                                                 
value $.01 per share              30,400               $ 30.37             $   923,400.00         $   279.82
Common Stock, par                                                                                 
value $.01 per share              22,900               $ 27.75             $   635,475.00         $   192.57
Common Stock, par                                                                                 
value $.01 per share             162,455               $ 25.00             $ 4,061,375.00         $ 1,230.72
                                 -------                                   --------------         ----------
TOTAL                            944,903                                   $14,603,376.82         $ 4,425.28        
============================================================================================================
<FN>
(1)      With respect to 782,448 shares of Common Stock underlying options gtanted pursuant to the Iron
         Mountain Incorporated 1995 Stock Incentive Plan, the proposed maximum offering price per share and
         the proposed maximum aggregate offering price have been based upon the per share and aggregate
         exercise prices.  With respect to the remaining 162,455 shares issuable under the 1995 Stock Incentive
         Plan, the proposed maximum offering price per share and the proposed maximum aggregate offering
         price have been estimated solely for purpose of calculating the amount of the registration fee in
         accordance with Rules 457(c) and 457(h) under the Securities Act of 1933, as amended, on the basis of
         the average of the high and low prices of the Commons Stock on the Nasdaq National Market on April
         4, 1997.
</FN>
</TABLE>



<PAGE>



PART II - INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.

         The  following  documents,  which  have  been  filed  by Iron  Mountain
Incorporated (the "Company") with the Commission,  are incorporated by reference
in and made a part of this Registration Statement, as of their respective dates:

         (a)      The  Company's  Annual Report on Form 10-K for the fiscal year
                  ended December 31, 1996; and

         (b)      The description of the Common Stock contained in the Company's
                  registration  statement  on Form 8-A dated  January  18,  1996
                  (File No. 0-27584),  including any amendments or reports filed
                  for the purpose of updating such description.

         All documents  subsequently  filed by the Company  pursuant to Sections
13(a),  13(c), 14 and 15(d) of the Securities  Exchange Act of 1934, as amended,
prior to the  filing of a  post-effective  amendment  which  indicates  that all
securities  offered  have been sold or which  deregisters  all  securities  then
remaining  unsold,  shall be  deemed to be  incorporated  by  reference  in this
Registration  Statement  and to be part  hereof  from the date of filing of such
documents.

         Any  statement  contained  in a document  incorporated  or deemed to be
incorporated  by reference  herein shall be deemed to be modified or  superseded
for  purposes  of this  Registration  Statement  to the extent  that a statement
herein,  or in any subsequently  filed document which also is or is deemed to be
incorporated by reference,  modifies or supersedes such statement. Any statement
so  modified  or  superseded  shall  not be  deemed,  except as so  modified  or
superseded, to constitute a part of this Registration Statement.

Item 4.  Description of Securities.

         Not applicable.

Item 5.  Interests of Named Experts and Counsel.

         The validity of the shares  offered  hereby will be passed upon for the
Company by Sullivan & Worcester LLP,  Boston,  Massachusetts.  Jas. Murray Howe,
Secretary of the Company,  is of counsel to Sullivan & Worcester  LLP and is the
owner of 3,855 shares of Common Stock.

Item 6.  Indemnification of Directors and Officers

         Section  145 of the  Delaware  General  Corporation  Law  (the  "DGCL")
provides, in effect, that any person made a party to any action by reason of the
fact that he is or was a director, officer, employee or agent of the Company may
and, in certain cases,  must be indemnified by the Company against,  in the case
of a non-derivative  action,  judgments,  fines,  amounts paid in settlement and
reasonable expenses  (including  attorney's fees) incurred by him as a result of
such action, and in the case of a derivative action, against expenses (including
attorney's  fees),  if in either  type of action he acted in good faith and in a
manner he reasonably  believed to be in or not opposed to the best  interests of
the Company.  This  indemnification  does not apply, in a derivative  action, to
matters as to which it is adjudged that the director, officer, employee or agent
is liable to the Company, unless upon court order it is determined that, despite
such  adjudication  of liability,  but in view of all the  circumstances  of the
case, he is fairly and reasonably entitled to indemnity for expenses,  and, in a
non-derivative  action,  to any  criminal  proceeding  in which such  person had
reasonable cause to believe his conduct was unlawful.


                                     II - 1


<PAGE>



         Article  Sixth of the  Company's  Amended and Restated  Certificate  of
Incorporation  provides that the Company shall  indemnify  each person who is or
was an officer or director of the Company to the  fullest  extent  permitted  by
Section 145 of the DGCL.

         Article  Seventh of the Company's  Amended and Restated  Certificate of
Incorporation  states that no  director  of the  Company  shall be liable to the
Company or its stockholders for monetary damages for breach of fiduciary duty as
a  director,  except  to the  extent  that  exculpation  from  liability  is not
permitted under the DGCL as in effect when such breach occurred.

Item 7.  Exemption from Registration Claimed

         Not Applicable.

Item 8.  Exhibits.
                                  EXHIBIT INDEX

         Exhibit No.       Description


         5        Opinion of Sullivan & Worcester LLP.*

         23.1     Consent of Sullivan & Worcester LLP  (contained in the opinion
                  of Sullivan & Worcester LLP filed herewith as Exhibit 5).

         23.2     Consent of Arthur Andersen LLP.*

         24       Power  of  Attorney   (included  in  signature  page  of  this
                  Registration Statement).

*Filed herewith.

Item 9.  Undertakings.

         (a)  The undersigned registrant hereby undertakes:

                  (1) to file,  during any  period in which  offers or sales are
         being made, a post-effective amendment to this Registration Statement:

         (i)      to include any prospectus  required by Section 10(a)(3) of the
                  Securities Act of 1933;

         (ii)     to reflect in the prospectus any facts or events arising after
                  the effective date of the Registration  Statement (or the most
                  recent post-effective  amendment thereof) which,  individually
                  or in the  aggregate,  represent a  fundamental  change in the
                  information set forth in the registration statement;

         (iii)    to include any material  information  with respect to the plan
                  of distribution  not previously  disclosed in the registration
                  statement or any material  change to such  information  in the
                  registration statement:

         provided,  however,  that  paragraphs  (a)(1)(i) and  (a)(1)(ii) do not
         apply if the  information  required to be included in a  post-effective
         amendment by those paragraphs is contained in periodic reports filed by
         the Company  pursuant to Section 13 or Section 15(d) of the  Securities
         Exchange  Act  of  1934  that  are  incorporated  by  reference  in the
         registration statement;


                                     II - 2


<PAGE>

                  (2) that, for the purpose of determining  any liability  under
         the Securities Act of 1933, each such post-effective amendment shall be
         deemed to be a new  registration  statement  relating to the securities
         offered therein, and the offering of such securities at that time shall
         be deemed to be the initial bona fide offering thereof; and

                  (3) to remove from  registration by means of a  post-effective
         amendment any of the securities being registered which remain unsold at
         the termination of the offering;

         (b) The undersigned  registrant hereby undertakes that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
Company's  annual  report  pursuant  to Section  13(a) or  Section  15(d) of the
Securities  Exchange  Act of 1934  (and,  where  applicable,  each  filing of an
employee  benefit  plan's  annual  report  pursuant  to  Section  15(d)  of  the
Securities  Exchange  Act of 1934)  that is  incorporated  by  reference  in the
Registration  Statement  shall  be  deemed  to be a new  registration  statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof; and

         (c)  Insofar  as  indemnification  for  liabilities  arising  under the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons of the Company pursuant to the foregoing provisions,  or otherwise,  the
Company has been  advised  that in the opinion of the  Securities  and  Exchange
Commission  such  indemnification  is against public policy as expressed in that
Act  and  is,  therefore,   unenforceable.   In  the  event  that  a  claim  for
indemnification  against such liabilities (other than the payment by the Company
of expenses incurred or paid by a director, officer or controlling person of the
Company in the successful defense of any action, suit or proceeding) is asserted
by  such  director,  officer  or  controlling  person  in  connection  with  the
securities  being  registered,  the Company  will,  unless in the opinion of its
counsel the matter has been settled by controlling precedent,  submit to a court
of appropriate  jurisdiction the question whether such  indemnification by it is
against  public  policy as expressed in the  Securities  Act of 1933 and will be
governed by the final adjudication of such issue.



                                     II - 3


<PAGE>


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the Company
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-8 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Boston, Commonwealth of Massachusetts, on the 9th day
of April, 1997.

                                    IRON MOUNTAIN INCORPORATED



                                    By: /s/ C. Richard Reese
                                        C. Richard Reese
                                        Chairman of the Board,
                                        Chief Executive Officer and Director

         The  undersigned  Officers and Directors of Iron Mountain  Incorporated
(the "Company") hereby severally  constitute C. Richard Reese, Eugene B. Doggett
and  David S.  Wendell,  and each of them  acting  singly,  our true and  lawful
attorneys to sign for us and in our names in the capacities  indicated below any
amendments  to  this   Registration   Statement  on  Form  S-8   (including  any
post-effective  amendments  hereto) and to file the same, with Exhibits  thereto
and other  documents in connection  therewith,  with the Securities and Exchange
Commission,  granting unto each of said attorneys, acting singly, full power and
authority to do and perform each and every act and thing  requisite or necessary
to be done in and about the premises, as fully to all intents and purposes as he
might or could do in person,  hereby  ratifying and confirming our signatures to
said amendments to this Registration  Statement signed by our said attorneys and
all else  that said  attorneys  may  lawfully  do and cause to be done by virtue
hereof.

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement has been signed below by the following persons on behalf
of the Company and in the capacities and on the 9th day of April, 1997.

       Signatures                            Title



        /s/ C. Richard Reese
       C. Richard Reese                 Chairman, Chief
                                        Executive Officer and Director


        /s/David S. Wendell
       David S. Wendell                 President, Chief Operating Officer and
                                        Director


        /s/Eugene B. Doggett
       Eugene B. Doggett                Executive Vice President, Chief
                                        Financial Officer and Director


        /s/ Constantin R. Boden
       Constantin R. Boden              Director




                                     II - 4


<PAGE>





        /s/ Arthur D. Little
       Arthur D. Little                 Director



       /s/ Vincent J. Ryan
       Vincent J. Ryan                  Director



        /s/ Jean A. Bua
       Jean A. Bua                      Vice President and Corporate
                                        Controller




                                     II - 5
[{"type": "S-8", "sequence": "1", "secsgml_size_bytes": 17542}]
{"company-data": {"conformed-name": "IRON MOUNTAIN INC /DE", "cik": "0001004317", "assigned-sic": "4220", "irs-number": "043107342", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-24803", "film-number": "97576951"}, "business-address": {"street1": "745 ATLANTIC AVE", "city": "BOSTON", "state": "MA", "zip": "02111", "phone": "6173574455"}, "mail-address": {"street1": "745 ATLANTIC AVENUE", "street2": "7TH FLOOR", "city": "BOSTON", "state": "MA", "zip": "02111"}}
As filed with the Securities and Exchange Commission on April 9, 1997
                                                   Registration No. 333-

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                 --------------

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                                  ------------

                           IRON MOUNTAIN INCORPORATED
               (Exact name of issuer as specified in its charter)

        Delaware                                               04-3107342
(State or other jurisdiction of                              (I.R.S. Employer
incorporation or organization)                              Identification No.)

                745 Atlantic Avenue, Boston, Massachusetts 02111
                                 (617) 357-4455
           (Address of Principal Executive Offices including zip code)
                                  -------------

              Iron Mountain Incorporated 1995 Stock Incentive Plan
                            (Full titles of the plan)
                                  ------------

                                C. Richard Reese
                            Chairman of The Board of
                     Directors and Chief Executive Officer
                           Iron Mountain Incorporated
                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
                                 (617) 357-4455
            (Name, address and telephone number of agent for service)
                                  -------------

                                    Copy to:
                             William J. Curry, Esq.
                            Sullivan & Worcester LLP
                             One Post Office Square
                           Boston, Massachusetts 02109
                                 (617) 338-2800
                                ----------------
---------------
CALCULATION OF REGISTRATION FEE

                                                     Proposed            Proposed Maximum  
  Title of Securities         Amount to be       Maximum Offering            Aggregate            Amount of
   to be Registered            Registered       Price Per Share(1)       Offering Price(1)     Registration Fee
   ----------------            ----------       ------------------       -----------------     ----------------
Common Stock, par
value $.01 per share             231,667               $  6.48             $ 1,501,202.16         $   454.91
Common Stock, par                                                                                 
value $.01 per share              77,177               $ 12.58             $   970,886.66         $   294.21
Common Stock, par                                                                                 
value $.01 per share              65,152               $ 16.12             $ 1,050,576.00         $   318.36
Common Stock, par                                                                                 
value $.01 per share             355,152               $ 15.37             $ 5,460,462.00         $ 1,654.69
Common Stock, par                                                                                 
value $.01 per share              30,400               $ 30.37             $   923,400.00         $   279.82
Common Stock, par                                                                                 
value $.01 per share              22,900               $ 27.75             $   635,475.00         $   192.57
Common Stock, par                                                                                 
value $.01 per share             162,455               $ 25.00             $ 4,061,375.00         $ 1,230.72
                                 -------                                   --------------         ----------
TOTAL                            944,903                                   $14,603,376.82         $ 4,425.28        
============================================================================================================
(1)      With respect to 782,448 shares of Common Stock underlying options gtanted pursuant to the Iron
         Mountain Incorporated 1995 Stock Incentive Plan, the proposed maximum offering price per share and
         the proposed maximum aggregate offering price have been based upon the per share and aggregate
         exercise prices.  With respect to the remaining 162,455 shares issuable under the 1995 Stock Incentive
         Plan, the proposed maximum offering price per share and the proposed maximum aggregate offering
         price have been estimated solely for purpose of calculating the amount of the registration fee in
         accordance with Rules 457(c) and 457(h) under the Securities Act of 1933, as amended, on the basis of
         the average of the high and low prices of the Commons Stock on the Nasdaq National Market on April
         4, 1997.
PART II - INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.

         The  following  documents,  which  have  been  filed  by Iron  Mountain
Incorporated (the "Company") with the Commission,  are incorporated by reference
in and made a part of this Registration Statement, as of their respective dates:

         (a)      The  Company's  Annual Report on Form 10-K for the fiscal year
                  ended December 31, 1996; and

         (b)      The description of the Common Stock contained in the Company's
                  registration  statement  on Form 8-A dated  January  18,  1996
                  (File No. 0-27584),  including any amendments or reports filed
                  for the purpose of updating such description.

         All documents  subsequently  filed by the Company  pursuant to Sections
13(a),  13(c), 14 and 15(d) of the Securities  Exchange Act of 1934, as amended,
prior to the  filing of a  post-effective  amendment  which  indicates  that all
securities  offered  have been sold or which  deregisters  all  securities  then
remaining  unsold,  shall be  deemed to be  incorporated  by  reference  in this
Registration  Statement  and to be part  hereof  from the date of filing of such
documents.

         Any  statement  contained  in a document  incorporated  or deemed to be
incorporated  by reference  herein shall be deemed to be modified or  superseded
for  purposes  of this  Registration  Statement  to the extent  that a statement
herein,  or in any subsequently  filed document which also is or is deemed to be
incorporated by reference,  modifies or supersedes such statement. Any statement
so  modified  or  superseded  shall  not be  deemed,  except as so  modified  or
superseded, to constitute a part of this Registration Statement.

Item 4.  Description of Securities.

         Not applicable.

Item 5.  Interests of Named Experts and Counsel.

         The validity of the shares  offered  hereby will be passed upon for the
Company by Sullivan & Worcester LLP,  Boston,  Massachusetts.  Jas. Murray Howe,
Secretary of the Company,  is of counsel to Sullivan & Worcester  LLP and is the
owner of 3,855 shares of Common Stock.

Item 6.  Indemnification of Directors and Officers

         Section  145 of the  Delaware  General  Corporation  Law  (the  "DGCL")
provides, in effect, that any person made a party to any action by reason of the
fact that he is or was a director, officer, employee or agent of the Company may
and, in certain cases,  must be indemnified by the Company against,  in the case
of a non-derivative  action,  judgments,  fines,  amounts paid in settlement and
reasonable expenses  (including  attorney's fees) incurred by him as a result of
such action, and in the case of a derivative action, against expenses (including
attorney's  fees),  if in either  type of action he acted in good faith and in a
manner he reasonably  believed to be in or not opposed to the best  interests of
the Company.  This  indemnification  does not apply, in a derivative  action, to
matters as to which it is adjudged that the director, officer, employee or agent
is liable to the Company, unless upon court order it is determined that, despite
such  adjudication  of liability,  but in view of all the  circumstances  of the
case, he is fairly and reasonably entitled to indemnity for expenses,  and, in a
non-derivative  action,  to any  criminal  proceeding  in which such  person had
reasonable cause to believe his conduct was unlawful.

                                     II - 1
Article  Sixth of the  Company's  Amended and Restated  Certificate  of
Incorporation  provides that the Company shall  indemnify  each person who is or
was an officer or director of the Company to the  fullest  extent  permitted  by
Section 145 of the DGCL.

         Article  Seventh of the Company's  Amended and Restated  Certificate of
Incorporation  states that no  director  of the  Company  shall be liable to the
Company or its stockholders for monetary damages for breach of fiduciary duty as
a  director,  except  to the  extent  that  exculpation  from  liability  is not
permitted under the DGCL as in effect when such breach occurred.

Item 7.  Exemption from Registration Claimed

         Not Applicable.

Item 8.  Exhibits.
                                  EXHIBIT INDEX

         Exhibit No.       Description

         5        Opinion of Sullivan & Worcester LLP.*

         23.1     Consent of Sullivan & Worcester LLP  (contained in the opinion
                  of Sullivan & Worcester LLP filed herewith as Exhibit 5).

         23.2     Consent of Arthur Andersen LLP.*

         24       Power  of  Attorney   (included  in  signature  page  of  this
                  Registration Statement).

*Filed herewith.

Item 9.  Undertakings.

         (a)  The undersigned registrant hereby undertakes:

                  (1) to file,  during any  period in which  offers or sales are
         being made, a post-effective amendment to this Registration Statement:

         (i)      to include any prospectus  required by Section 10(a)(3) of the
                  Securities Act of 1933;

         (ii)     to reflect in the prospectus any facts or events arising after
                  the effective date of the Registration  Statement (or the most
                  recent post-effective  amendment thereof) which,  individually
                  or in the  aggregate,  represent a  fundamental  change in the
                  information set forth in the registration statement;

         (iii)    to include any material  information  with respect to the plan
                  of distribution  not previously  disclosed in the registration
                  statement or any material  change to such  information  in the
                  registration statement:

         provided,  however,  that  paragraphs  (a)(1)(i) and  (a)(1)(ii) do not
         apply if the  information  required to be included in a  post-effective
         amendment by those paragraphs is contained in periodic reports filed by
         the Company  pursuant to Section 13 or Section 15(d) of the  Securities
         Exchange  Act  of  1934  that  are  incorporated  by  reference  in the
         registration statement;

                                     II - 2
(2) that, for the purpose of determining  any liability  under
         the Securities Act of 1933, each such post-effective amendment shall be
         deemed to be a new  registration  statement  relating to the securities
         offered therein, and the offering of such securities at that time shall
         be deemed to be the initial bona fide offering thereof; and

                  (3) to remove from  registration by means of a  post-effective
         amendment any of the securities being registered which remain unsold at
         the termination of the offering;

         (b) The undersigned  registrant hereby undertakes that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
Company's  annual  report  pursuant  to Section  13(a) or  Section  15(d) of the
Securities  Exchange  Act of 1934  (and,  where  applicable,  each  filing of an
employee  benefit  plan's  annual  report  pursuant  to  Section  15(d)  of  the
Securities  Exchange  Act of 1934)  that is  incorporated  by  reference  in the
Registration  Statement  shall  be  deemed  to be a new  registration  statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof; and

         (c)  Insofar  as  indemnification  for  liabilities  arising  under the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons of the Company pursuant to the foregoing provisions,  or otherwise,  the
Company has been  advised  that in the opinion of the  Securities  and  Exchange
Commission  such  indemnification  is against public policy as expressed in that
Act  and  is,  therefore,   unenforceable.   In  the  event  that  a  claim  for
indemnification  against such liabilities (other than the payment by the Company
of expenses incurred or paid by a director, officer or controlling person of the
Company in the successful defense of any action, suit or proceeding) is asserted
by  such  director,  officer  or  controlling  person  in  connection  with  the
securities  being  registered,  the Company  will,  unless in the opinion of its
counsel the matter has been settled by controlling precedent,  submit to a court
of appropriate  jurisdiction the question whether such  indemnification by it is
against  public  policy as expressed in the  Securities  Act of 1933 and will be
governed by the final adjudication of such issue.

                                     II - 3
SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the Company
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-8 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Boston, Commonwealth of Massachusetts, on the 9th day
of April, 1997.

                                    IRON MOUNTAIN INCORPORATED

                                    By: /s/ C. Richard Reese
                                        C. Richard Reese
                                        Chairman of the Board,
                                        Chief Executive Officer and Director

         The  undersigned  Officers and Directors of Iron Mountain  Incorporated
(the "Company") hereby severally  constitute C. Richard Reese, Eugene B. Doggett
and  David S.  Wendell,  and each of them  acting  singly,  our true and  lawful
attorneys to sign for us and in our names in the capacities  indicated below any
amendments  to  this   Registration   Statement  on  Form  S-8   (including  any
post-effective  amendments  hereto) and to file the same, with Exhibits  thereto
and other  documents in connection  therewith,  with the Securities and Exchange
Commission,  granting unto each of said attorneys, acting singly, full power and
authority to do and perform each and every act and thing  requisite or necessary
to be done in and about the premises, as fully to all intents and purposes as he
might or could do in person,  hereby  ratifying and confirming our signatures to
said amendments to this Registration  Statement signed by our said attorneys and
all else  that said  attorneys  may  lawfully  do and cause to be done by virtue
hereof.

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement has been signed below by the following persons on behalf
of the Company and in the capacities and on the 9th day of April, 1997.

       Signatures                            Title

        /s/ C. Richard Reese
       C. Richard Reese                 Chairman, Chief
                                        Executive Officer and Director

        /s/David S. Wendell
       David S. Wendell                 President, Chief Operating Officer and
                                        Director

        /s/Eugene B. Doggett
       Eugene B. Doggett                Executive Vice President, Chief
                                        Financial Officer and Director

        /s/ Constantin R. Boden
       Constantin R. Boden              Director

                                     II - 4
/s/ Arthur D. Little
       Arthur D. Little                 Director

       /s/ Vincent J. Ryan
       Vincent J. Ryan                  Director

        /s/ Jean A. Bua
       Jean A. Bua                      Vice President and Corporate
                                        Controller

                                     II - 5