| FEF | Four Eight Four | 四八四 |
| FEF | Failure of Equipment Family (Alcatel) | 设备系列故障（阿尔卡特） |
| FEF | Free Enterprise Fund | 免费企业基金 |
| FEF | Future Engineer Force | 未来工程师队伍 |
| FEF | FundaciÓn Europea de FormaciÓn (Spanish) | FundaciÓn Europea de FormaciÓn (Spanish) |
| FEF | Foundry Educational Foundation | 铸造教育基金会 |
| FEF | Functional Evaluation Flight | 功能评估飞行 |
| FEF | French Erotic Film | 法国色情电影 |
| FEF | Fastest Edge First (algorithm) | 最快边优先（算法） |
| FEF | Forced Expiratory Flow (lung function) | 强制呼气流量（肺功能） |
| FEF | Frontal Eye Field | 正面视野 |
| FEF | Forced Expiratory Flow | 强制呼气流量 |
| FEF | Family of Equipment Failure (Nortel) | 设备故障系列（北电） |
| FEF | Familial Erythrophagocytic Lymphohistiocytosis | 家族性吞噬红细胞淋巴瘤 |
| FEF | Fuel Examination Facility | 燃料检查设施 |
| FEF | Front Endpaper (book) | 前端纸（书本） |
| FEF | Flexible Elastomeric Foam | 柔性弹性泡沫 |
| FEF | Free Earth Foundation (Doylestown, PA) | 自由地球基金会（宾夕法尼亚州道尔镇） |
| FEF | FederaciÓn Ecuatoriana de FÚtbol (Spanish, Ecuador) | FederaciÓn Ecuatoriana de FÚtbol (Spanish, Ecuador) |
| FEF | Front End Fee | 前端费用 |
| FEF | Fried Egg Flowers | 煎蛋花 |