- Ubi Island
- Uchixsax
- Ugaiushak Island
- Ugak Island
- Ugak Island
- Ugalux
- Ugamak Island
- Uganik (historical)
- Uganik Island
- Ugashik
- Ugidak Island
- Ukak
- Ukivok
- Uknavik
- Ukolnoi Island
- Ukolnoi Rocks
- Ulak Island
- Ulak Island
- Uliaga Island
- Ulinoi Island
- Ulloa Island
- Umak Island
- Umga Island
- Umiat
- Umkumiute
- Umla Island
- Umnak Island
- Unalakleet
- Unalaska
- Unalaska Island