| IFF | Identification Friend or Foe | 敌我识别 |
| IFF | Interchange File Format | 文件交换格式 |
| IFF | Intergovernmental Forum on Forests | 政府间森林问题论坛 |
| IFF | Interactive Fan Fiction | 互动粉丝小说 |
| IFF | Integral Force Feedback | 积分力反馈 |
| IFF | Iffley, Queensland, Australia | 澳大利亚昆士兰州伊夫利 |
| IFF | Interchangeable File Format | 可交换文件格式 |
| IFF | Independent Film Festival | 独立电影节 |
| IFF | Commodore Amiga Image format | 阿米加准将图像格式 |
| IFF | iliac-femoral flap | 髂股皮瓣 |
| IFF | Bitmap graphics or sound (Amiga IFF/8SVX Interchange File Format) | 点阵图形和声音(Amiga嗅/ 8SVX交换文件格式) |
| IFF | inner fracture face | 内破裂面 |
| IFF | International Flavors & Fragrances | 国际风味和香料 |
| IFF | Identification Of Friend Or Foe | 敌我识别 |
| IFF | International Flexwork Forum | 国际弹性工作论坛 |
| IFF | Identification, Friend or Foe | 身份，朋友或敌人 |
| IFF | International Finance Facility | 国际融资机制 |
| IFF | If and Only If | 当且仅当 |
| IFF | International Flying Farmers | 国际飞行农民 |
| IFF | International Film Festival | 国际电影节 |
| IFF | International Floorball Federation (Helsinki, Finland) | 国际地板球联合会（芬兰赫尔辛基） |
| IFF | Image File Format | 图像文件格式 |
| IFF | Intrastate Funding Formula | 州内融资公式 |
| IFF | Iraq Freedom Fund | 伊拉克自由基金 |
| IFF | International Food Festival | 国际食品节 |
| IFF | Industrial Funding Fee | 工业融资费 |
| IFF | Interferon Fibroblast | 干扰素成纤维细胞 |
| IFF | I Feel Fine (Beatles song) | 我感觉很好（披头士歌曲） |
| IFF | International Flavors and Fragrances | 国际香精香料 |
| IFF | Indice Di FunzionalitÀ Fluviale (Italian: River Functionality Index) | Indice Di FunzionalitÀ Fluviale (Italian: River Functionality Index) |
| IFF | Information Flow Framework Language | 信息流框架语言 |
| IFF | Introduction to Fighter Fundamentals (US Air Force flight training) | 战斗机基础介绍（美国空军飞行训练） |