English abbreviations from uik to uiu
- UIK (Ust-Ilimsk Airport)
- UIL (University Interscholastic League (governing body for most interscholastic activities, notably sports, in Texas public high schools))
- UIM (User Interaction Management)
- UIMS (Undergraduate International Medical Service)
- UIN (Quincy Regional Airport (Baldwin Field))
- UINDY (University of Indianapolis)
- UI-NEW (Unit of Issue - New)
- UIO (Mariscal Sucre International Airport)
- UIP (Quimper - Cornouaille Airport)
- UIQ (Quoin Hill Airport)
- UIR (upper information region)
- UIRT (University Industry Research And Technology)
- UIRV (Unique Interswitch Rekeying Variable)
- UIS (Unclamped Inductive Switching)
- UISD (IIS Anti-leech Sniffer Dog)
- UISL (User Interface Standard Library)
- UIT (Jaluit Airport (FAA: N55))
- UiTM (Universiti Teknologi Mara)
- UIU (Understanding the Integral Universe)