- ACX stands for Atlantic City Expressway (toll road; New Jersey)
- ACX stands for Active Control Experts (industrial engineering consultants; Cambridge, MA)
- ACX stands for Available Chemicals Exchange
- ACX stands for Australian Climate Exchange
- ACX stands for Asia Carbon Exchange (Asia Carbon Global)
- ACX stands for Assistant Chief Executive (South Holland, UK)
- ACX stands for Advanced Combat Experimental
Abbreviations And Their Meaning