Crab Island may refer to:

United States:

• Crab Island (Florida), a shoal near Destin, Florida
• Crab Island (Lake Champlain), New York
• Crab Island (Washington), one of the San Juan Islands
• Crab Island (West Virginia), on the Ohio River
• A former British name for Vieques, Puerto Rico

Elsewhere:

• Crab Island (Queensland), Australia, in the western Torres Strait
• Crab Island, Guyana, at the mouth of the Berbice River
• Crab Island, Malaysia (Pulau Ketam)

See also

• Crab Cay, Colombia, in the Caribbean Sea
• Crab Key, a fictional Caribbean island in the James Bond novel Dr. No and the film adaptation