- ACSU stands for Advanced (T-1) Channel Service Unit
- ACSU stands for Anti-Corruption and Security Unit (International Cricket Council)
- ACSU stands for Air Cooled Split Unit (ventillation)
- ACSU stands for American Cancer Society University
- ACSU stands for Association of Computer Science Undergraduates
- ACSU stands for American Conservative Student Union
- ACSU stands for Add-Compare-Select Unit
- ACSU stands for Adult Crisis Stabilization Unit
- ACSU stands for Antenna Configuration Switching Unit
- ACSU stands for Air Combat Support Unit (UK)
ACSU