<?xml version="1.0" encoding="UTF-8"?><ns2:edgarSubmission xmlns:com="http://www.sec.gov/edgar/common" xmlns:ns2="http://www.sec.gov/edgar/ownership">
    <ns2:headerData>
        <ns2:submissionType>144</ns2:submissionType>
        <ns2:filerInfo>
            <ns2:filer>
                <ns2:filerCredentials>
                    <ns2:cik>0001032553</ns2:cik>
                    <ns2:ccc>XXXXXXXX</ns2:ccc>
                </ns2:filerCredentials>
            </ns2:filer>
            <ns2:liveTestFlag>LIVE</ns2:liveTestFlag>



        </ns2:filerInfo>
    </ns2:headerData>
    <ns2:formData>
        <ns2:issuerInfo>
            <ns2:issuerCik>0000936395</ns2:issuerCik>
            <ns2:issuerName>Ciena Corporation</ns2:issuerName>
            <ns2:secFileNumber>001-36250</ns2:secFileNumber>
            <ns2:issuerAddress>
                <com:street1>7035 Ridge Road</com:street1>
                <com:city>Hanover</com:city>
                <com:stateOrCountry>MD</com:stateOrCountry>
                <com:zipCode>21076</com:zipCode>
            </ns2:issuerAddress>
            <ns2:issuerContactPhone>1-410-694-5700</ns2:issuerContactPhone>
            <ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Gary B. Smith</ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <ns2:relationshipsToIssuer>
                <ns2:relationshipToIssuer>Officer</ns2:relationshipToIssuer>
            </ns2:relationshipsToIssuer>
        </ns2:issuerInfo>
        <ns2:securitiesInformation>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:brokerOrMarketmakerDetails>
                <ns2:name>Goldman Sachs &amp; Co. LLC</ns2:name>
                <ns2:address>
                    <com:street1>200 West Street</com:street1>
                    <com:city>New York</com:city>
                    <com:stateOrCountry>NY</com:stateOrCountry>
                    <com:zipCode>10282</com:zipCode>
                </ns2:address>
            </ns2:brokerOrMarketmakerDetails>
            <ns2:noOfUnitsSold>40800</ns2:noOfUnitsSold>
            <ns2:aggregateMarketValue>2422704</ns2:aggregateMarketValue>
            <ns2:noOfUnitsOutstanding>142145676</ns2:noOfUnitsOutstanding>
            <ns2:approxSaleDate>04/15/2025</ns2:approxSaleDate>
            <ns2:securitiesExchangeName>NYSE</ns2:securitiesExchangeName>
        </ns2:securitiesInformation>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:acquiredDate>12/20/2022</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as Compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>29306</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>12/20/2022</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:acquiredDate>03/20/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as Compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Issuer</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>11494</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>03/20/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>N</ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>02/18/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>305232.28</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>03/03/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>254386.3</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>04/01/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>204465.46</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>03/17/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>219960.62</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>02/18/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>302637.06</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>01/15/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>288243.84</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>04/01/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>207598.56</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>02/03/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>290575.56</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>03/17/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>223246.72</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>03/03/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>265170.76</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>02/03/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>286495.22</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:securitiesSoldInPast3Months>
            <ns2:sellerDetails>
                <ns2:name>Gary B. Smith</ns2:name>
                <ns2:address>
                    <com:street1>7035 Ridge Road</com:street1>
                    <com:city>Hanover</com:city>
                    <com:stateOrCountry>MD</com:stateOrCountry>
                    <com:zipCode>21076</com:zipCode>
                </ns2:address>
            </ns2:sellerDetails>
            <ns2:securitiesClassTitle>common</ns2:securitiesClassTitle>
            <ns2:saleDate>01/15/2025</ns2:saleDate>
            <ns2:amountOfSecuritiesSold>3400</ns2:amountOfSecuritiesSold>
            <ns2:grossProceeds>291738.7</ns2:grossProceeds>
        </ns2:securitiesSoldInPast3Months>
        <ns2:remarks>The sales of shares set forth herein are made in connection with a selling plan dated September 11, 2024 that is intended to comply with Rule 10b5-1(c).</ns2:remarks>
        <ns2:noticeSignature>
            <ns2:noticeDate>04/15/2025</ns2:noticeDate>
            <ns2:planAdoptionDates>
                <ns2:planAdoptionDate>09/11/2024</ns2:planAdoptionDate>
            </ns2:planAdoptionDates>
            <ns2:signature>Goldman Sachs &amp; Co. LLC on behalf of Gary B. Smith</ns2:signature>
        </ns2:noticeSignature>
    </ns2:formData>
</ns2:edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 13526}]
144
0001032553
XXXXXXXX
LIVE
0000936395
Ciena Corporation
001-36250
7035 Ridge Road
Hanover
MD
21076
1-410-694-5700
Gary B. Smith
Officer
Common Stock
Goldman Sachs & Co. LLC
200 West Street
New York
NY
10282
40800
2422704
142145676
04/15/2025
NYSE
Common Stock
12/20/2022
Acquired as Compensation -- Restricted Stock Units
Issuer
N
29306
12/20/2022
Compensation
Common Stock
03/20/2023
Acquired as Compensation -- Restricted Stock Units
Issuer
N
11494
03/20/2023
Compensation
N
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
02/18/2025
3400
305232.28
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
03/03/2025
3400
254386.3
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
04/01/2025
3400
204465.46
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
03/17/2025
3400
219960.62
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
02/18/2025
3400
302637.06
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
01/15/2025
3400
288243.84
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
04/01/2025
3400
207598.56
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
02/03/2025
3400
290575.56
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
03/17/2025
3400
223246.72
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
03/03/2025
3400
265170.76
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
02/03/2025
3400
286495.22
Gary B. Smith
7035 Ridge Road
Hanover
MD
21076
common
01/15/2025
3400
291738.7
The sales of shares set forth herein are made in connection with a selling plan dated September 11, 2024 that is intended to comply with Rule 10b5-1(c).
04/15/2025
09/11/2024
Goldman Sachs & Co. LLC on behalf of Gary B. Smith