PMO may refer to:

Government and military

  • Polish Military Organisation, an intelligence and sabotage group during World War I
  • Prime Minister's Office (disambiguation), government departments in several countries
  • Principal Medical Officer, a senior position
  • Priority Material Office, a logistics support command of the United States Navy
  • Privatization and Management Office, a Philippine government agency

Science

  • Periodic mesoporous organosilica, a form of silica
  • Phosphorodiamidate morpholino oligo, a biochemical
  • Planetary-mass object, in astronomy
  • Prosopometamorphopsia, a visual disorder

Other uses

  • Falcone Borsellino Airport, Italy (IATA code: PMO)
  • Pine Mountain Observatory, an astronomical telescope in Oregon, US
  • Project management office, a internal standards group
  • pmo, 2020s slang for 'piss me off'