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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">UNITED STATES</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">SECURITIES AND EXCHANGE COMMISSION</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Washington, D.C. &#160;20549</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">___________</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">FORM 8-K</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">CURRENT REPORT</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">Date of Report (Date of earliest event reported): <font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">February 14, 2018</font></div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">___________</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">FIRST NATIONAL CORPORATION</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Exact name of registrant as specified in its charter)</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Virginia</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(State or other jurisdiction</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">of incorporation)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">0-23976</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">54-1232965</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(IRS Employer</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">Identification No.)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">112 West King Street</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Strasburg, Virginia</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Address of principal executive offices)</div>
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<div>&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">22657</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Zip Code)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">Registrant's telephone number, including area code: <font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">(540) 465-9121</font></div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Not Applicable</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Former name or former address, if changed since last report)</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</div>

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<div style="TEXT-ALIGN: left; MARGIN-LEFT: 18pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">&#9633;</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 18pt; DISPLAY: inline-block">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</font></div>

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<div style="TEXT-ALIGN: left; MARGIN-LEFT: 18pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">&#9633;</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 18pt; DISPLAY: inline-block">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></div>

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<div style="TEXT-ALIGN: left; MARGIN-LEFT: 18pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">&#9633;</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 18pt; DISPLAY: inline-block">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</font></div>

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<div style="TEXT-ALIGN: left; MARGIN-LEFT: 18pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">&#9633;</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 18pt; DISPLAY: inline-block">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</font></div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">&#160;</div>

<div style="FONT-SIZE: 10pt; MARGIN-BOTTOM: 5pt; FONT-FAMILY: 'Times New Roman', Times, serif; MARGIN-TOP: 5pt; TEXT-ALIGN: left">Emerging growth company&#160; &#9633;&#160;&#160;&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.&#160; <font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">&#9633;</font></div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">On February 14, 2018, director Dr. Miles K. Davis informed the Board of Directors of First National Corporation (the "Company"), of his intention to not stand for re-election to the Board of Directors of the Company at the upcoming annual meeting of shareholders on May 8, 2018.&#160; Dr. Davis' decision to not stand for re-election to the Board of Directors of the Company is not the result of any disagreement with the Company.</div>

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<div style="TEXT-ALIGN: left"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Item 5.03<font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 9pt; DISPLAY: inline-block">&#160;</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 9pt; DISPLAY: inline-block">&#160;</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 9pt; DISPLAY: inline-block">&#160;</font></font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.</font></div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">(a) On February 14, 2018, the Board of Directors of the&#160;Company amended Article II (A) of its Bylaws to decrease the size of the Board of Directors from nine (9) to seven (7) members effective as of the date of the 2018 annual meeting of shareholders.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">The full text of the Bylaws, as amended to date, is attached as Exhibit 3.1 to this report and is incorporated by reference into this Item 5.03.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Other Events.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">On February 20, 2018, the&#160;Company issued a press release announcing a quarterly cash dividend of $0.05 per common share, which is payable on March 16, 2018 to shareholders of record as of March 2, 2018.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">A copy of the press release is being furnished as Exhibit 99.1 to this report and is incorporated by reference into this Item 8.01.</div>

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<div style="TEXT-ALIGN: left"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Item 9.01<font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 9pt; DISPLAY: inline-block">&#160;</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 9pt; DISPLAY: inline-block">&#160;</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 9pt; DISPLAY: inline-block">&#160;</font></font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">Financial Statements and Exhibits.</font></div>

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<div style="TEXT-ALIGN: left"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">(d)</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; WIDTH: 36pt; DISPLAY: inline-block">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">Exhibits. &#160;</font></div>

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<div style="TEXT-ALIGN: left"><u>Exhibit No.</u></div>
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<div style="TEXT-ALIGN: left"><u>Description</u></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">3.1</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Bylaws of First National Corporation (as restated in electronic format as of February 14, 2018)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Press Release dated February 20, 2018</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">SIGNATURES</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: left">FIRST NATIONAL CORPORATION</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">(Registrant)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Date:&#160; February 20, 2018</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">By:</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">&#160;/s/ M. Shane Bell</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">M. Shane Bell</div>
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<div style="TEXT-ALIGN: left"><u>Description</u></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Bylaws of First National Corporation (as restated in electronic format as of February 14, 2018)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Press Release dated February 20, 2018</div>
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{"company-data": {"conformed-name": "FIRST NATIONAL CORP /VA/", "cik": "0000719402", "assigned-sic": "6022", "irs-number": "541232965", "state-of-incorporation": "VA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-23976", "film-number": "18623711"}, "business-address": {"street1": "112 WEST KING STREET", "city": "STRASBURG", "state": "VA", "zip": "22657", "phone": "5404659121"}, "mail-address": {"street1": "112 WEST KING STREET", "city": "STRASBURG", "state": "VA", "zip": "22657"}}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549
___________
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported):
February 14, 2018
___________
FIRST NATIONAL CORPORATION
(Exact name of registrant as specified in its charter)
Virginia
(State or other jurisdiction
of incorporation)
0-23976
(Commission File Number)
54-1232965
(IRS Employer
Identification No.)
112 West King Street
Strasburg, Virginia
(Address of principal executive offices)
22657
(Zip Code)
Registrant's telephone number, including area code:
(540) 465-9121
Not Applicable
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
□
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
□
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
□
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
□
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.
Emerging growth company  □
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
□
Item 5.02
Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On February 14, 2018, director Dr. Miles K. Davis informed the Board of Directors of First National Corporation (the "Company"), of his intention to not stand for re-election to the Board of Directors of the Company at the upcoming annual meeting of shareholders on May 8, 2018.  Dr. Davis' decision to not stand for re-election to the Board of Directors of the Company is not the result of any disagreement with the Company.
Item 5.03
Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.
(a) On February 14, 2018, the Board of Directors of the Company amended Article II (A) of its Bylaws to decrease the size of the Board of Directors from nine (9) to seven (7) members effective as of the date of the 2018 annual meeting of shareholders.
The full text of the Bylaws, as amended to date, is attached as Exhibit 3.1 to this report and is incorporated by reference into this Item 5.03.
Item 8.01
Other Events.
On February 20, 2018, the Company issued a press release announcing a quarterly cash dividend of $0.05 per common share, which is payable on March 16, 2018 to shareholders of record as of March 2, 2018.
A copy of the press release is being furnished as Exhibit 99.1 to this report and is incorporated by reference into this Item 8.01.
Item 9.01
Financial Statements and Exhibits.
(d)
Exhibits.
Exhibit No.
Description
3.1
Bylaws of First National Corporation (as restated in electronic format as of February 14, 2018)
99.1
Press Release dated February 20, 2018
2
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
FIRST NATIONAL CORPORATION
(Registrant)
Date:  February 20, 2018
By:
/s/ M. Shane Bell
M. Shane Bell
Executive Vice President and Chief Financial Officer
3
EXHIBIT INDEX
Exhibit No.
Description
3.1
Bylaws of First National Corporation (as restated in electronic format as of February 14, 2018)
99.1
Press Release dated February 20, 2018
4