| Rank | Abbreviation | Meaning |
|---|
| ***** | ACEN | Anime Central
| |
| **** | ACEN | Association of Computer Engineers Nepal
| |
| **** | ACEN | Academy of Canadian Executive Nurses
| |
| **** | ACEN | Association of Consulting Engineers Nigeria
| |
| **** | ACEN | Asociación para la Conservación y el Estudio de la Naturaleza
| |
| *** | ACEN | Assembly of Captive European Nations
| |
| *** | ACEN | Association of Consulting Engineers of Namibia
| |
| ** | ACEN | Association of Consulting Engineers of Norway
| |
| ** | ACEN | Asociacion de Cafes Especiales de Nicaragua
| |
| ** | ACEN | Anglican Communion Environmental Network
| |
| ** | ACEN | Acenapthene
| |
| * | ACEN | Australian College of Emergency Nursing
| |
| * | ACEN | Association Caennaise des Etudiants Naturalistes
| |
| * | ACEN | Australian Collaborative Education Network
| |
| * | ACEN | AMERICAN COMMUNICATIONS ENTERPRISES, INC.
| |
| * | ACEN | Academy of Chief Executive Nurses
| |
| * | ACEN | African Community Education Network
| |
| * | ACEN | Australian Cooperative Education Network
| |
| * | ACEN | Asian Chemical Education Network
| |
| * | ACEN | Art Com Electronic Network
| |