Apo or APO may refer to:

• African Press Organization
• Acting Pilot Officer, the lowest commissioned grade in the Royal Air Force
• Acute Pulmomary Oedema, fluid accumulation on the lungs
• African Political Organization, a Coloured political organization in early twentieth century South Africa
• Alpha Phi Omega, a U.S. service fraternity
• Apo, a god of mountains in Inca mythology
• Serok Apo or Abdullah calan, Kurdistan Workers Party leader
• Apochromat, a type of photographic or other lens
• Apoprotein, a protein without its bound cofactor
• Apotex, Canadian pharmaceutical company, producer of generic drugs
• Application Performance Optimization
• Army Post Office: chiefly U.S. Army and U.S. Air Force postal services. Also See military mail
• Association for Professional Observers, an association of fisheries observers
• , a political protest movement in West Germany during the 1960s and 1970s
• Authorized Personnel Only, a fictional black ops unit on Alias
• After Peak Oil, an epoch used in dating years following the estimated Peak of Global Oil Production

Places

• Apo Island, a volcanic island in the Philippines
• Mount Apo, a stratovolcano on the island of Mindanao in the Philippines
• Kara River or Apo, a tributary of the Danube in the Banat region of Serbia and Romania
• Apo-eup, an eup in Gimcheon, Gyeongsangbuk-do, central South Korea
• Apache Point Observatory, an observatory in the Sacramento Mountains in Sunspot, New Mexico, U.S.

Music

• Auckland Philharmonia Orchestra
• Armenian Philharmonic Orchestra
• APO Hiking Society, a Filipino singing group
• Aldworth Philharmonic Orchestra, the orchestra of Reading Blue Coat School

Noble Title

• see Datu, one of the traditional Philippine noble titles used along with Datu, Lakan and Sultan, depending on the prestige and wealth of the nobleman.

See also

• Apolipoprotein, lipid-binding protein
• APU (disambiguation)

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