| Acronym | Definition |
|---|
| FCJ | Formula Challenge Japan (racing) |
| FCJ | Fonds de Conservation Jeunesse (French: Youth Conservation Fund) |
| FCJ | Fidèles Compagnes de Jésus (French: Faithful Companions of Jesus) |
| FCJ | Foyer Culturel des Jeunes (French: Youth Cultural Household) |
| FCJ | Football Club Javerlhacois (French football club) |
| FCJ | Franklin County Jail (Chambersburg, PA) |
| FCJ | Foreign Criminal Jurisdiction |
| FCJ | Fine Chemical Japan Co., Ltd. (Tokyo, Japan) |
| FCJ | Ferrari Club Japan (automobile club; est. 1989) |
| FCJ | Football Club Jonquiérois (French football club) |
| FCJ | Faithful Companion of Jesus, Sisters (religious order) |
| FCJ | Football Club Juventus |
| FCJ | Full Copper Jacket |
| FCJ | Fine-needle-Catheter Jejunostomy |