- ACEN stands for Anime Central (website)
- ACEN stands for Academy of Canadian Executive Nurses (Ottawa, Ontario, Canada)
- ACEN stands for Association of Consulting Engineers Nigeria (est. 1972; Lagos, Nigeria)
- ACEN stands for Anglican Communion Environmental Network
- ACEN stands for Association of Computer Engineers Nepal (est. 2003)
- ACEN stands for Assembly of Captive European Nations
ACEN