- AOW: OSI Asia Oceania Workshop
- CCITT: Consultative Committee for International Telephone and Telegraph
- CEN/CENELEC: Comitato Europeo di Normalizzazione (ELECtr.)
- COS: Corporation for Open Systems
- COSINE: COS Interconnection Networking Europe
- ECMA: European Computer Manufacturers Association
- EurOSInet: European OSI Network
- EWOS: European Workshop for Open Systems
- IEEE: Institute of Electrical and Electronic Engineers
- OSI/NMF: OSI/Network Management Forum
- OIW: OSI Implementers' Workshop (US)
- OSINET: OSI NETwork
- OSIone: OSI organization for network establishment
- OTL: OSI Testing Liaison group
- POSI: Promoting conference for OSI
- SPAG: Std Promotion and Application Group
- ecc.

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