- Sinitsin Island
- Sinuk
- Sister Islands
- Sister Islands
- Sister Rock
- Sisters Island
- Sitam Hachan Tanangis
- Sitka
- Sitkalidak Island
- Sitkinak Island
- Sitklan Island
- Situk
- Sitxidam Ungluu
- Sitymkan
- Siwash Island
- Sixmile Island
- Sixmile Island
- Sixmile Island
- Sixteenmile Island
- Sixty-foot Rock
- Skagul Island
- Skagway
- Skiff Island
- Skin Island
- Skinner Island
- Skowl Island
- Skwentina
- Skwentna
- Slana
- Slate Creek