AMX is a three-letter abbreviation with multiple meanings, as described below:

• AMX a producer/DJ located in the United States
• The AMX, a car made by American Motors Corporation
• The AMX International AMX, a fighter aircraft
• AMX International, the company that makes the aircraft
• AMX Mod a server-side modification for Half-Life games
• AMX Corporation, a manufacturer of audio-visual control devices
• AMX 30, AMX 13 and AMX 10 tanks produced by GIAT Industries
• AMX index, a stock market index of Euronext Amsterdam.