Snake Island may refer to:

• Snake Island (New South Wales), in the Hawkesbury River
• Snake Island (Tasmania)
• Snake Island (Victoria)

• Ilha da Queimada Grande, nicknamed Snake Island, located off the southeastern corner of Brazil
• Ilha das Cobras, off the coast of Rio de Janeiro

• Snake Island (Nanaimo)
• Snake Island (Lake Simcoe)
• Snake Island, one of the Toronto Islands in Lake Ontario
• Snake Island Lake, a lake in Ontario

• Snake Island (Lagos)

• Snake Island (Ukraine), in the Black Sea

• Snake Island (Massachusetts)
• Isla Culebra, Puerto Rico

• St. Thomas Island, also known as Snake Island, in the Black Sea, Bulgaria
• Kalampunian Damit Island, Malaysia
• Golem Grad, also known as Snake Island, North Macedonia
• Vigan Island, also known as Snake Island, Philippines

• Snake Island (film), a 2002 film
• Treasure Quest: Snake Island, an American reality television series

• Serpent Island (disambiguation)