APX
APX stands for:
- APX Group (Amsterdam Power Exchange), energy exchange founded in 1999, merged with EPEX SPOT in 2015
 - LVR-Archaeological Park Xanten , park with original and reconstructed Roman buildings
 - 1,7-diamino-1,7-dinitrimino-2,4,6-trinitro-2,4,6-triazaheptane , a newer explosive
 - 47 mm APX , French anti-tank gun from the Second World War.
 - Nvidia APX 2500 , processor from Nvidia
 - Class of effectively approximable problems in computer science; see approximation algorithm
 - Black and white film from Agfa
 
apx stands for:
- Aputai (ISO-639-3 code), dialect of the Malayo-Polynesian language Wetar (language)