| APO | a final climactic stage |
|---|---|
| APO | type genus of the Apogonidae |
| APO | found in tropical Atlantic coastal waters |
| APO | bright-colored marine fishes that incubate eggs in the mouth |
| APO | bees |
| APO | apoapsis in orbit around Jupiter |
| APO | large siphonophore of up to 50 ft long |
| APO | politically neutral |
| APO | French poet |
| APO | Greek god of light |
| APO | an asteroid whose orbit crosses the Earth's orbit |
| APO | a program of space flights undertaken by US to land a man on the moon |