- Ugamak Island
- Ukolnoi Island
- Ukolnoi Rocks
- Umga Island
- Umla Island
- Unalga Island
- Unga Island
- Unimak Island
- Ugak Island
- Ugak Island
- Uganik (historical)
- Uganik Island
- Ushagat Island
- Uski Island
- Utesistoi Island
- Utukakarvik
- Ugaiushak Island
- Unavikshak Island
- Ukivok
- Ubi Island
- Ulloa Island
- Unlucky Island
- Ulinoi Island
- Unishka Island
- Urilof Island
- Ugashik
- Unalakleet
- Unalaska
- Utopia Creek