OASIS believes collaborative relationships with other international standards-setting bodies are essential for minimizing the risk of divergent approaches to standardization, avoiding duplication of efforts and ensuring interoperability.

OASIS maintains active technical liaison relationships with the following groups:

OASIS participates in a Memorandum of Understanding on Electronic Business with the International Electrotechnical Commission (IEC), the International Organization for Standardization (ISO), the International Telecommunication Union (ITU), and the United Nations Economic Commission for Europe (UN/ECE). The groups work together to increase coordination across many different international programs for more efficient standards development and more rapid adoption in the global marketplace.

UN/CEFACT, the United Nations Centre for Trade Facilitation and Electronic Business, and OASIS jointly sponsor ebXML, a modular suite of specifications that enable enterprises of any size and in any geographical location to conduct business over the Internet. Using ebXML, companies now have a standard method to exchange business messages, conduct trading relationships, communicate data in common terms and define and register business processes.

As an ISO TC154 Class A Liaison member, OASIS actively participates in the technical work of this committee, which focuses on e-business standards. Likewise, TC154 is a Contributor member of OASIS, and ISO representatives are involved in related work of the many OASIS technical committees that develop e-business specifications.

OASIS is a Category A Liaison member of the ISO/IEC (International Organization for Standardization/ International Electrotechnical Commission). ISO/IEC JTC1/SC34 (the Subcommittee for Document Description and Processing Languages of the ISO/IEC Joint Technical Committee One on Information Technology) is an OASIS Contributor member. This relationship allows representatives from each group to participate in the standards development work of the other.

OASIS is a cosponsor of the Interoperability Summit that regularly brings together major standards groups and consortia from around the world to identify common ground and coordinate development of electronic business specifications. Other Interoperability Summit cosponsors include HR-XML, OMG, and XBRL.org.

The National Institute of Standards and Technology (NIST) is a Sponsor member of OASIS that provides major contributions to the OASIS technical agenda, including XML conformance and ebXML development.

LISA, the Localization Industry Standards Association, works in harmony with OASIS on developing standards for multi-lingual data exchange. LISA is an OASIS Contributor member, and OASIS is a Liaison member of LISA.