<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001444157</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0000936395</issuerCik>
            <issuerName>Ciena Corporation</issuerName>
            <secFileNumber>001-36250</secFileNumber>
            <issuerAddress>
                <ns2:street1>7035 Ridge Road</ns2:street1>
                <ns2:city>Hanover</ns2:city>
                <ns2:stateOrCountry>MD</ns2:stateOrCountry>
                <ns2:zipCode>21076</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>4106945700</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>DAVID ROTHENSTEIN</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>2500</noOfUnitsSold>
            <aggregateMarketValue>180400.00</aggregateMarketValue>
            <noOfUnitsOutstanding>141367218</noOfUnitsOutstanding>
            <approxSaleDate>06/16/2025</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>12/20/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2500</amountOfSecuritiesAcquired>
            <paymentDate>12/20/2022</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for DAVID ROTHENSTEIN </name>
                <address>
                    <ns2:street1>7035 Ridge Road</ns2:street1>
                    <ns2:city>Hanover</ns2:city>
                    <ns2:stateOrCountry>MD</ns2:stateOrCountry>
                    <ns2:zipCode>21076</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/15/2025</saleDate>
            <amountOfSecuritiesSold>2500</amountOfSecuritiesSold>
            <grossProceeds>199826.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for DAVID ROTHENSTEIN </name>
                <address>
                    <ns2:street1>7035 Ridge Road</ns2:street1>
                    <ns2:city>Hanover</ns2:city>
                    <ns2:stateOrCountry>MD</ns2:stateOrCountry>
                    <ns2:zipCode>21076</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>04/15/2025</saleDate>
            <amountOfSecuritiesSold>2500</amountOfSecuritiesSold>
            <grossProceeds>148685.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for DAVID ROTHENSTEIN </name>
                <address>
                    <ns2:street1>7035 Ridge Road</ns2:street1>
                    <ns2:city>Hanover</ns2:city>
                    <ns2:stateOrCountry>MD</ns2:stateOrCountry>
                    <ns2:zipCode>21076</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/24/2025</saleDate>
            <amountOfSecuritiesSold>2500</amountOfSecuritiesSold>
            <grossProceeds>172200.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The securities to be sold were acquired upon the vesting of restricted stock units during the period of 12/20/2022 through 9/20/2023.
</remarks>
        <noticeSignature>
            <noticeDate>06/16/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>12/23/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ David Rothenstein</signature>
        </noticeSignature>
    </formData>
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144
0001444157
XXXXXXXX
LIVE
0000936395
Ciena Corporation
001-36250
7035 Ridge Road
Hanover
MD
21076
4106945700
DAVID ROTHENSTEIN
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
2500
180400.00
141367218
06/16/2025
NYSE
Common
12/20/2022
Restricted Stock Units
Issuer
N
2500
12/20/2022
N/A
N
10b5-1 Sales for DAVID ROTHENSTEIN
7035 Ridge Road
Hanover
MD
21076
Common
05/15/2025
2500
199826.00
10b5-1 Sales for DAVID ROTHENSTEIN
7035 Ridge Road
Hanover
MD
21076
Common
04/15/2025
2500
148685.00
10b5-1 Sales for DAVID ROTHENSTEIN
7035 Ridge Road
Hanover
MD
21076
Common
03/24/2025
2500
172200.00
The securities to be sold were acquired upon the vesting of restricted stock units during the period of 12/20/2022 through 9/20/2023.
06/16/2025
12/23/2024
/s/ David Rothenstein