MO
MO may stand for:
- Abu Dhabi Amiri Flight and Calm Air IATA airline designators
- Altria Group (formerly Philip Morris) stock symbol
- Macau (ISO 3166-1 alpha-2 country code)
- Magneto-optical, as in Magneto-optical drive
- Missouri (U.S. state)
- Milicja Obywatelska
- Modus operandi, or method of operation
- Molecular orbital
- Province of Modena
- Modern Orthodox Judaism
See also Mo.