| Acronym | Definition |
|---|
| OSIT➣Open Source Intelligence Techniques (Michael Bazzell book) |
| OSIT➣On-Site Inspection Team |
| OSIT➣Operational Strategies Implementation Team (Australian Strategic Air Traffic Management Group) |
| OSIT➣Oulun Selittämättömien Ilmiöiden Tutkimusseura (Finnish: Oulu Muddled Phenomena Research Society; paranormal research group; Oulu, Finland) |