- AEFS stands for Fleet Replenishment Ship (US Navy designation)
- AEFS stands for Advanced Elementary Formal Systems (computer science)
- AEFS stands for Airport Equipment Fueling System
- AEFS stands for Advanced Electronic Flight Strips
- AEFS stands for Anti-Exposure Flight Suit
- AEFS stands for American Expeditionary Forces Siberia (US DoD; post-World War I)
AEFS