<?xml version="1.0" encoding="UTF-8"?>
<!--SAIIM V1.0 (22-04-2026)-->
<xbrli:xbrl xmlns:in-capmkt="http://www.sebi.gov.in/xbrl/2026-03-31/in-capmkt" xmlns:in-capmkt-ent="http://www.sebi.gov.in/xbrl/Schedule_Of_Analysts_Or_Institutional_Investors_Meeting/2026-03-31/in-capmkt/in-capmkt-ent" xmlns:in-capmkt-roles="http://www.sebi.gov.in/xbrl/Schedule_Of_Analysts_Or_Institutional_Investors_Meeting/2026-03-31/in-capmkt-roles" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:in-capmkt-types="http://www.sebi.gov.in/xbrl/2026-03-31/in-capmkt-types" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:net="http://www.xbrl.org/2009/role/net" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xl="http://www.xbrl.org/2003/XLink"><link:schemaRef xlink:type="simple" xlink:href="in-capmkt-ent-2026-03-31.xsd"/><xbrli:context id="MainI"><xbrli:entity><xbrli:identifier scheme="http://www.sebi.gov.in/in-capmkt/ScripCode">500312</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:instant>2026-08-01</xbrli:instant></xbrli:period></xbrli:context><xbrli:context id="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1"><xbrli:entity><xbrli:identifier scheme="http://www.sebi.gov.in/in-capmkt/ScripCode">500312</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:instant>2026-08-01</xbrli:instant></xbrli:period><xbrli:scenario><xbrldi:typedMember dimension="in-capmkt:IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeetingAxis"><in-capmkt:IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeetingDomain>IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeetingDomain1</in-capmkt:IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeetingDomain></xbrldi:typedMember></xbrli:scenario></xbrli:context><in-capmkt:NSESymbol contextRef="MainI">ONGC</in-capmkt:NSESymbol><in-capmkt:NameOfTheCompany contextRef="MainI">Oil &amp; Natural Gas Corporation Limited</in-capmkt:NameOfTheCompany><in-capmkt:ScripCode contextRef="MainI">500312</in-capmkt:ScripCode><in-capmkt:MSEISymbol contextRef="MainI">NOTLISTED</in-capmkt:MSEISymbol><in-capmkt:ISIN contextRef="MainI">INE213A01029</in-capmkt:ISIN><in-capmkt:TypeOfAnnouncement contextRef="MainI">New</in-capmkt:TypeOfAnnouncement><in-capmkt:PurposeOfDisclosure contextRef="MainI">Schedule of Analysts or Institutional Investors Meet</in-capmkt:PurposeOfDisclosure><in-capmkt:StageOfMeetingOrCallOrConferenceOrEvent contextRef="MainI">Intimation</in-capmkt:StageOfMeetingOrCallOrConferenceOrEvent><in-capmkt:DateOfReport contextRef="MainI">2026-08-01</in-capmkt:DateOfReport><in-capmkt:TypeOfMeetingForWhichIntimationIsGiven contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Earning/Quarterly Calls</in-capmkt:TypeOfMeetingForWhichIntimationIsGiven><in-capmkt:DateOfMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">2026-08-05</in-capmkt:DateOfMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:TimeOfCommencementOfMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">15:30:00</in-capmkt:TimeOfCommencementOfMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:NameOfMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Earning (Quarterly Conference Call)</in-capmkt:NameOfMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:PlaceOfMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Deendayal Urja Bhavan, ONGC, New Delhi</in-capmkt:PlaceOfMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:NameOfTheFundOrCompanyOfAnalystOrInstitutionalInvestorWithWhomTheMeetingIsScheduledForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Group of Investors/Analysts</in-capmkt:NameOfTheFundOrCompanyOfAnalystOrInstitutionalInvestorWithWhomTheMeetingIsScheduledForIntimation><in-capmkt:NameOfAnalystOrInstitutionalInvestorWithWhomTheMeetingIsScheduledForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Group of Investors/Analysts</in-capmkt:NameOfAnalystOrInstitutionalInvestorWithWhomTheMeetingIsScheduledForIntimation><in-capmkt:DesignationOfPersonWithWhomTheMeetingIsScheduledForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Group of Investors/Analysts</in-capmkt:DesignationOfPersonWithWhomTheMeetingIsScheduledForIntimation><in-capmkt:TypeOfMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Group Meeting</in-capmkt:TypeOfMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:ModeOfMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Virtual</in-capmkt:ModeOfMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:AgendaOrReasonForMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Earning (Quarterly Conference Call)</in-capmkt:AgendaOrReasonForMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:QuarterForWhichEarningsOrQuarterlyCallIsHeldForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Q1 Results</in-capmkt:QuarterForWhichEarningsOrQuarterlyCallIsHeldForIntimation><in-capmkt:WeblinkOfMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">https://reg.dsnl.in/DSNL/form/ONGCLtd/formperma/xS-6-EpafwngLsQqqOnJYrW_bPGC7qP0dpOz4A1yi7Y</in-capmkt:WeblinkOfMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:DialInNumbersForMeetingOrCallOrConferenceOrEventForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Pan India Access Number
Dial in Access Numbers: 086 3416 8832 &amp; 086 4536 7270

Toll Free Number – International
USA: 1877 387 0849/1800 974 0768, UK: 0800 016 3439/0808 101 7155 
Singapore: 800 101 1941, Hong Kong: 800 903 171

International Direct Toll Access: +91 44 7116 3030</in-capmkt:DialInNumbersForMeetingOrCallOrConferenceOrEventForIntimation><in-capmkt:NameOfContactPersonForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">Mukesh Kumar</in-capmkt:NameOfContactPersonForIntimation><in-capmkt:ContactDetailsOfContactPersonForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">011- 2675-3047</in-capmkt:ContactDetailsOfContactPersonForIntimation><in-capmkt:EmailIDOfContactPersonForIntimation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">irc@ongc.co.in</in-capmkt:EmailIDOfContactPersonForIntimation><in-capmkt:WhetherIntimationOfMeetingIncludesPresentation contextRef="I_IntimationOrScheduleOfAnalystsOrInstitutionalInvestorsMeeting1">false</in-capmkt:WhetherIntimationOfMeetingIncludesPresentation></xbrli:xbrl>
