The Cayman Islands (/ˈkeɪmən/) is a self-governing British Overseas Territory in the western Caribbean Sea. The 264-square-kilometre (102-square-mile) territory comprises the three islands of Grand Cayman, Cayman Brac and Little Cayman, which are located to the south of Cuba and northeast of Honduras, between Jamaica and Mexico's Yucatán Peninsula. The capital city is George Town on Grand Cayman, which is the most populous of the three islands.

The Cayman Islands is considered to be part of the geographic Western Caribbean Zone as well as the Greater Antilles. The territory is considered a controversial major world offshore financial haven for international businesses and wealthy individuals, largely as a result of the state not charging taxes on any income earned or stored.

The islands are in the western Caribbean Sea and are the peaks of an undersea mountain range called the Cayman Ridge (or Cayman Rise). This ridge flanks the Cayman Trough, 6,000 m (20,000 ft) deep which lies 6 km (3.7 mi) to the south. The islands lie in the northwest of the Caribbean Sea, east of Quintana Roo, Mexico and Yucatán State, Mexico, northeast of Costa Rica, north of Panama, south of Cuba and west of Jamaica. They are situated about 700 km (430 mi) south of Miami, 750 km (470 mi) east of Mexico, 366 km (227 mi) south of Cuba, and about 500 km (310 mi) northwest of Jamaica. Grand Cayman is by far the largest, with an area of 197 km2 (76 sq mi). Grand Cayman's two "sister islands", Cayman Brac and Little Cayman, are about 120 km (75 mi) east north-east of Grand Cayman and have areas of 38 and 28.5 km2 (14.7 and 11.0 sq mi) respectively. The nearest land mass from Grand Cayman is the Canarreos Archipelago (about 240 km or 150 miles away), whereas the nearest from the easternmost island Cayman Brac is the Jardines de la Reina archipelago (about 160 km or 100 miles away) – both of which are part of Cuba.

All three islands were formed by large coral heads covering submerged ice-age peaks of western extensions of the Cuban Sierra Maestra range and are mostly flat. One notable exception to this is The Bluff on Cayman Brac's eastern part, which rises to 43 m (141 ft) above sea level, the highest point on the islands.

Terrain is mostly a low-lying limestone base surrounded by coral reefs.