| FLB | flow brazing | 波峰钎焊 |
| FLB | For lens blooming | 涂镜用 |
| FLB | Federal Land Bank | 联邦土地银行 |
| FLB | Funny Looking Beat (medical/cardiac slang) | 看起来滑稽的医疗/心脏俚语击败() |
| FLB | Funny Little Beat (EMS slang) | 有趣的小节拍（EMS俚语） |
| FLB | Fantasy League Baseball | 幻想棒球联盟 |
| FLB | FÉdÉration Libanaise de Basketball (French: Lebanese Basketball Federation) | FÉdÉration Libanaise de Basketball (French: Lebanese Basketball Federation) |
| FLB | Fly Like A Bird (song) | 像鸟一样飞翔（歌曲） |
| FLB | Forward Logistics Base | 前方后勤基地 |
| FLB | Fluorescently Labeled Bacteria | 荧光标记细菌 |
| FLB | Front de Liberation de la Bretagne (French: Breton Liberation Front) | 布列塔尼解放阵线（法语：Breton Liberation Front） |
| FLB | Format library (Papyrus) | 格式库（Papyrus） |
| FLB | funny-looking beat | 看起来滑稽的节拍 |
| FLB | Floriano, PI, Brazil | 巴西佛罗里达州弗洛里亚诺 |
| FLB | Fletcher Challenge Building Division | 弗莱彻挑战建筑部 |