| FECS | Federation of European Chemical Societies | 欧洲化学学会联合会 |
| FECS | Federation of European Cancer Societies | 欧洲癌症学会联合会 |
| FECS | FÉdÉration des Enseignants des Commissions Scolaires | FÉdÉration des Enseignants des Commissions Scolaires |
| FECS | Foilborne Engine Control System | 箔片发动机控制系统 |
| FECS | Forward Error Correction Seconds (Nortel) | 前向纠错秒数（北电） |