| Acronym | Definition |
|---|
| BISI➣Background Information Services Inc. (Boulder, CO) |
| BISI➣British Institute for the Study of Iraq (est. 1932; UK) |
| BISI➣British International School Istanbul (Turkey) |
| BISI➣Bielski Internetowy Serwis Informacyjny (Polish: Bielski Internet Information Service) |
| BISI➣Bloggers in Support of Israel |
| BISI➣Billing Integration Strategy Implementation |