- AESI stands for Adverse Event of Special Interest
- AeSI stands for Aeronautical Society of India
- AESI stands for Associated Engineering Sciences Inc
- AESI stands for Agricultural Environmental Stewardship Initiative (Canada)
- AESI stands for Acumen Engineered Solutions International, Inc. (est. 1984; Canada and US)
- AESI stands for Arrow Engineering Services Inc (Lancaster, CA)
- AESI stands for Advanced Electro-Mechanical Sales, Inc. (Washington and Oregon)
AESI