IFU or ifu may refer to:
- Institut für Unternehmenskybernetik
- Instructions for Use
- integral field unit
- International Football Union
- IFU (International Fruit and Vegetable Juice Association)
- "IFU", song by Usher (singer)
IFU represents the worldwide juice sector interests as the registered Non-governmental organisation (NGO) at Codex Alimentarius. It also represents the sector with World Health Organisation (WHO), World Trade Organisation (WTO), World Customs Organisation (WCO) and any other relevant governmental or intergovernmental organisation.