English abbreviations from omega to omn
- OMEGA (Open Multi Environment Grid Adapter)
- OMEL (Operator Minimum Equipment List)
- OMEN (Operation Miner Eighty Niner)
- OMEP (Office of Minority Engineering Programs)
- O. Merced. (Ordo Beatae Mariae Virginis de Redemptione Captivorum (Mercedarians, Nolaschi))
- OMF (King Hussein Air Base)
- OMFG (Oh My Fucking God)
- OMFTS (Operational Maneuver From The Sea)
- OMG (Oh My God or Or My Gosh)
- OMGUS (Office of the Military Government (U.S.))
- OMGW ("Oh My Gosh it's Windy")
- OMH (Orange County Airport)
- OMHA (Ontario Minor Hockey Association)
- OMI (Omidiyeh Air Base)
- O.M.I. (Oblati Mariae Immaculatae (Oblate Fathers of Mary Immaculate))
- OMK (Omak Airport)
- OML (Official Mercedes Lackey)
- OMLB (Originating Message Line Blocks)
- OMM (Olimpiada Mexicana de Matemáticas)
- OMMA (Online Media Marketing and Advertising)
- OMN (Oman (ISO 3166 trigram))
- Omn. (Omnes, Omnibus ("All", "to all"))