L
- (Sitka City and Borough) Liesnoi Island
- (Perry County) Liesnoi Island
- (Thomas County) Liesnoi Island
- (Sitka City and Borough) Liesnoi Island
- (Thomas County) Limb Island
- (Sitka City and Borough) Limit Island
- (Juneau City and Borough) Lincoln Island
- (Thomas County) Lincoln Island
- (Thomas County) Lincoln Rock
- (Sitka City and Borough) Line Island
- (Perry County) Link Island
- (Sitka City and Borough) Little Biorka Island
- (Perry County) Little Cedar Island
- (Thomas County) Little Dry Island
- (Sitka City and Borough) Little Gavanski Island
- (Madison County) Little Hamilton Island
- (Sitka City and Borough) Little Island
- (Madison County) Little Level Island
- (Sitka City and Borough) Little Rapids Island
- (Juneau City and Borough) Little Island
- (Ketchikan Gateway Borough) Little Rock
- (Sitka City and Borough) Little Rose Island
- (Madison County) Little Saltery Island
- (Sitka City and Borough) Little Wrangell Island
- (Prince of Wales-Hyder Census Area) Lively Islands
- (Sitka City and Borough) Lock Island
- (Sitka City and Borough) Lodge Island
- (Perry County) Lone Island
- (Prince of Wales-Hyder Census Area) Lone Tree Island
- (Perry County) Lone Tree Islet