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
  • Alpha Psi Omega, a U.S. honors theatre society
  • Apo, a god of mountains in Inca mythology
  • Serok Apo or Abdullah ├ľcalan, 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
  • Au├čerparlamentarische Opposition, 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

Read more about Apo:  Places, Music, Noble Title