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<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd http://www.w3.org/1999/xlink http://www.xbrl.org/2003/xlink-2003-12-31.xsd">
  <link:roleRef xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" roleURI="http://www.xbrl.org/2009/role/netLabel" />
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_totalLabel_labelfr" xml:lang="fr">Capacité d'autofinancement avant coût de l'endettement financier net et impôt</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital_totalLabel_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="FinanceIncomeCost" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="FinanceIncomeCost_totalLabel_labelfr" xml:lang="fr">RESULTAT FINANCIER</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinanceIncomeCost" xlink:to="FinanceIncomeCost_totalLabel_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_periodEndLabel_labelfr" xml:lang="fr">Trésorerie et équivalents de trésorerie si différents de l’état de la situation financière fermeture</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:to="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_periodEndLabel_labelfr" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_periodStartLabel_labelfr" xml:lang="fr">Trésorerie et équivalents de trésorerie si différents de l’état de la situation financière ouverture</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:to="CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_periodStartLabel_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="SouscriptionBsa" xlink:href="ose-2024-12-31.xsd#ose_SouscriptionBsa" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="SouscriptionBsa_label_labelfr" xml:lang="fr">Souscription de BSA</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SouscriptionBsa" xlink:to="SouscriptionBsa_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="VariationDesDettesFiscalesEtSociales" xlink:href="ose-2024-12-31.xsd#ose_VariationDesDettesFiscalesEtSociales" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="VariationDesDettesFiscalesEtSociales_label_labelfr" xml:lang="fr">Variation des dettes fiscales et sociales</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="VariationDesDettesFiscalesEtSociales" xlink:to="VariationDesDettesFiscalesEtSociales_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="VariationDeCapitalAga" xlink:href="ose-2024-12-31.xsd#ose_VariationDeCapitalAga" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="VariationDeCapitalAga_label_labelfr" xml:lang="fr">Variations de capital - Aga</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="VariationDeCapitalAga" xlink:to="VariationDeCapitalAga_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="CapitalIncrease" xlink:href="ose-2024-12-31.xsd#ose_CapitalIncrease" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CapitalIncrease_label_labelfr" xml:lang="fr">Augmentation de capital</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CapitalIncrease" xlink:to="CapitalIncrease_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ReservesEtResultatConsolidesMember" xlink:href="ose-2024-12-31.xsd#ose_ReservesEtResultatConsolidesMember" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ReservesEtResultatConsolidesMember_label_labelfr" xml:lang="fr">Réserves et résultats consolidés</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ReservesEtResultatConsolidesMember" xlink:to="ReservesEtResultatConsolidesMember_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="CapaciteDAutofinancementApresCoutDeLEndettementFinancierNetEtImpot" xlink:href="ose-2024-12-31.xsd#ose_CapaciteDAutofinancementApresCoutDeLEndettementFinancierNetEtImpot" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="CapaciteDAutofinancementApresCoutDeLEndettementFinancierNetEtImpot_label_labelfr" xml:lang="fr">Capacité d'autofinancement après coût de l'endettement financier net et impôt</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CapaciteDAutofinancementApresCoutDeLEndettementFinancierNetEtImpot" xlink:to="CapaciteDAutofinancementApresCoutDeLEndettementFinancierNetEtImpot_label_labelfr" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="CapaciteDAutofinancementApresCoutDeLEndettementFinancierNetEtImpot_totalLabel_labelfr" xml:lang="fr">Capacité d'autofinancement après coût de l'endettement financier net et impôt</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CapaciteDAutofinancementApresCoutDeLEndettementFinancierNetEtImpot" xlink:to="CapaciteDAutofinancementApresCoutDeLEndettementFinancierNetEtImpot_totalLabel_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="VariationCreancesDetteDimpots" xlink:href="ose-2024-12-31.xsd#ose_VariationCreancesDetteDimpots" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="VariationCreancesDetteDimpots_label_labelfr" xml:lang="fr">Variation créances/dette d'impôts</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="VariationCreancesDetteDimpots" xlink:to="VariationCreancesDetteDimpots_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="EliminationDuCoutDeLEndettementFinancierNet" xlink:href="ose-2024-12-31.xsd#ose_EliminationDuCoutDeLEndettementFinancierNet" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="EliminationDuCoutDeLEndettementFinancierNet_label_labelfr" xml:lang="fr">Elimination du coût de l'endettement financier net</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EliminationDuCoutDeLEndettementFinancierNet" xlink:to="EliminationDuCoutDeLEndettementFinancierNet_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ImpactIdSurEcartConversionBrevetOpi" xlink:href="ose-2024-12-31.xsd#ose_ImpactIdSurEcartConversionBrevetOpi" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ImpactIdSurEcartConversionBrevetOpi_label_labelfr" xml:lang="fr">Impact ID sur Ecart conversion brevet OPI</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ImpactIdSurEcartConversionBrevetOpi" xlink:to="ImpactIdSurEcartConversionBrevetOpi_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="NetDepreciationAndAmortization" xlink:href="ose-2024-12-31.xsd#ose_NetDepreciationAndAmortization" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="NetDepreciationAndAmortization_label_labelfr" xml:lang="fr">Dotations nettes aux amortissements</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NetDepreciationAndAmortization" xlink:to="NetDepreciationAndAmortization_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="VariationDesImmobilisationsFinancieres" xlink:href="ose-2024-12-31.xsd#ose_VariationDesImmobilisationsFinancieres" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="VariationDesImmobilisationsFinancieres_label_labelfr" xml:lang="fr">Variation des immobilisations financières</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="VariationDesImmobilisationsFinancieres" xlink:to="VariationDesImmobilisationsFinancieres_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="VariationDeCapitalBpsce" xlink:href="ose-2024-12-31.xsd#ose_VariationDeCapitalBpsce" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="VariationDeCapitalBpsce_label_labelfr" xml:lang="fr">Variations de capital - Bspce</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="VariationDeCapitalBpsce" xlink:to="VariationDeCapitalBpsce_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ExcerciceBPCEBsa" xlink:href="ose-2024-12-31.xsd#ose_ExcerciceBPCEBsa" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ExcerciceBPCEBsa_label_labelfr" xml:lang="fr">Exercice de BSPCE/BSA</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ExcerciceBPCEBsa" xlink:to="ExcerciceBPCEBsa_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ExcerciceBsaVester" xlink:href="ose-2024-12-31.xsd#ose_ExcerciceBsaVester" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ExcerciceBsaVester_label_labelfr" xml:lang="fr">Exercice BSA VESTER</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ExcerciceBsaVester" xlink:to="ExcerciceBsaVester_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="DotationsAuxAmortissementsSurDroitsDUtilisation" xlink:href="ose-2024-12-31.xsd#ose_DotationsAuxAmortissementsSurDroitsDUtilisation" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="DotationsAuxAmortissementsSurDroitsDUtilisation_label_labelfr" xml:lang="fr">Dotations aux amortissements sur droits d'utilisation</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="DotationsAuxAmortissementsSurDroitsDUtilisation" xlink:to="DotationsAuxAmortissementsSurDroitsDUtilisation_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ResultatOperationnelCourant" xlink:href="ose-2024-12-31.xsd#ose_ResultatOperationnelCourant" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ResultatOperationnelCourant_label_labelfr" xml:lang="fr">RESULTAT OPERATIONNEL COURANT</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ResultatOperationnelCourant" xlink:to="ResultatOperationnelCourant_label_labelfr" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="ResultatOperationnelCourant_totalLabel_labelfr" xml:lang="fr">RESULTAT OPERATIONNEL COURANT</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ResultatOperationnelCourant" xlink:to="ResultatOperationnelCourant_totalLabel_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="VariationDesDroitsDutilisations" xlink:href="ose-2024-12-31.xsd#ose_VariationDesDroitsDutilisations" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="VariationDesDroitsDutilisations_label_labelfr" xml:lang="fr">Encaissements liés aux cessions de droits d'utilisations</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="VariationDesDroitsDutilisations" xlink:to="VariationDesDroitsDutilisations_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities" xlink:href="ose-2024-12-31.xsd#ose_ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities_label_labelfr" xml:lang="fr">Variation du besoin en fonds de roulement (hors créances et dettes d'impôts)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities" xlink:to="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities_label_labelfr" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities_totalLabel_labelfr" xml:lang="fr">Variation du besoin en fonds de roulement (hors créances et dettes d'impôts)</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities" xlink:to="ChangeInWorkingCapitalRequirementExcludingReceivablesAndTaxLiabilities_totalLabel_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ReservesEtReportANouveau" xlink:href="ose-2024-12-31.xsd#ose_ReservesEtReportANouveau" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ReservesEtReportANouveau_label_labelfr" xml:lang="fr">Réserves et report à nouveau</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ReservesEtReportANouveau" xlink:to="ReservesEtReportANouveau_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="SouscriptionDeBsa" xlink:href="ose-2024-12-31.xsd#ose_SouscriptionDeBsa" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="SouscriptionDeBsa_label_labelfr" xml:lang="fr">Souscription de BSA</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SouscriptionDeBsa" xlink:to="SouscriptionDeBsa_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract" xlink:href="ose-2024-12-31.xsd#ose_ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract_label_labelfr" xml:lang="fr">Variation Trésorerie et équivalents de trésorerie si différents de l’état de la situation financière Abstract</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract" xlink:to="ChangesInCashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ReconnaissanceDuCAImpactEffimune" xlink:href="ose-2024-12-31.xsd#ose_ReconnaissanceDuCAImpactEffimune" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ReconnaissanceDuCAImpactEffimune_label_labelfr" xml:lang="fr">Reconnaissance du CA - impact N-1 Effimune</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ReconnaissanceDuCAImpactEffimune" xlink:to="ReconnaissanceDuCAImpactEffimune_label_labelfr" xlink:type="arc" />
    <link:loc xlink:type="locator" xlink:label="ShorttermDepositsClassifiedAsInvestingActivities" xlink:href="ose-2024-12-31.xsd#ose_ShorttermDepositsClassifiedAsInvestingActivities" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ShorttermDepositsClassifiedAsInvestingActivities_label_labelfr" xml:lang="fr">Souscription de dépôts à terme d'une durée supérieure à 3 mois</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ShorttermDepositsClassifiedAsInvestingActivities" xlink:to="ShorttermDepositsClassifiedAsInvestingActivities_label_labelfr" xlink:type="arc" />
  </link:labelLink>
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