- AECI stands for Agencia Espanola de Cooperacion Internacional (Spanish: Spanish International Cooperation Agency)
- AeCI stands for Aero Club d’Italia (Italian National Aero Club)
- AECI stands for Associated Electric Cooperative Inc.
- AECI stands for African Explosives and Chemical Industries
- AECI stands for Association of Electrical Contractors (Ireland)
- AECI stands for Allegheny Electric Cooperative, Inc. (Pennsylvania)
- AECI stands for Association Member of the Institute of Employment Consultants (UK)
Abbreviations And Their Meaning