Sandwich Islands was the name given to the Hawaiian Islands by James Cook in 1778.
Sandwich Island may also refer to:
- Manuae (Cook Islands), named Sandwich Island by Cook
- Efate in the Republic of Vanuatu, named Sandwich Island by Cook
- Sandwich Island sleeper, a species of fish endemic to the Hawaiian Islands
- South Georgia and the South Sandwich Islands, part of the British territory of South Georgia and the South Sandwich Islands
- Sandwich Islets, south of Bahía Cook, Chile