- CAEI stands for China Architectural Engineering, Inc.
- CAEI stands for Centre for Applied Emotional Intelligence (UK)
- CAEI stands for Christian Adventure Education Institute (est. 1998)
- CAEI stands for Copenhagen Adult Education Institute (Denmark)
- CAEI stands for C4ISR (Command, Control, Communications, Computers, Intelligence, Surveillance, and Reconnaissance) Acquisition Engineering & Integration (US DoD)
CAEI