La Gomera (Spanish: [la ɣoˈmeɾa] ⓘ) is one of Spain's Canary Islands, in the Atlantic Ocean off the coast of Africa. With an area of 370.03 km2 (142.87 sq mi), it is the third-smallest of the archipelago's eight main islands. It belongs to the province of Santa Cruz de Tenerife. La Gomera is the third least populous of the eight main Canary Islands, with 22,361 inhabitants at the start of 2023. Its capital is San Sebastián de La Gomera, where the cabildo insular (island council) is located.

The island is of volcanic origin and roughly circular; it is about 22 km (14 mi) in diameter. It is very mountainous and steeply sloping and rises to 1,487 m (4,879 ft) at its highest peak, Alto de Garajonay. Its shape is rather like an orange that has been cut in half and then split into segments, which has left deep ravines or barrancos between them.

The uppermost slopes of these barrancos, in turn, are covered by the laurisilva – or laurel rain forest, where up to 50 inches of precipitation fall each year.

The upper reaches of this densely wooded region are almost permanently shrouded in clouds and mist, and as a result are covered in lush and diverse vegetation. This area forms the protected environment of Spain's Garajonay National Park, which was declared a UNESCO World Heritage Site in 1986. The slopes are criss-crossed by trails of varying difficulty, offering views of the surrounding area.

The central mountains trap the moisture from the trade wind clouds and yield a temperate cloud forest climate, which contrasts with the warmer, sun-baked cliffs near sea level.

Between these extremes is a variety of microclimates. For centuries, La Gomera's inhabitants have farmed the lower levels by channelling runoff water to irrigate their vineyards, orchards and banana groves.