OM
- om – (s) Oromo language (ISO 639-1 code)
- OM – (s) Oman (ISO 3166 digram) – Olympique de Marseille (French football club)
- OMA – (i) Open Mobile Alliance – Operations & Maintenance, Army
- OMB – (i) U.S. Office of Management and Budget – Ontario Municipal Board – (i) Order of Mapungubwe in Bronze
- OMD – (i) Orchestral Manoeuvres in the Dark (1980s pop group)
- OME – (i) Osaka Mercantile Exchange
- OMFG – (i) Oh My Fucking God
- OMG – (i) Oh My God or Or My Gosh
- OMGW – (i) "Oh My Gosh it's Windy"
- OMN – (s) Oman (ISO 3166 trigram)
- OMNCS – (i) U.S. Office of the Manager for the National Communications System
- OMP – (i) Order of Mapungubwe in Platinum
- OMR – (s) Omani rial (ISO 4217 currency code)
- OMS – (i) Order of Mapungubwe in Silver
- OMT – (i) Object Model Template
- OMW – (i) On My Way, Oh My Word
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