Lanzarote is a Spanish island, the northernmost and easternmost of the autonomous Canary Islands in the Atlantic Ocean. It is located approximately 125 kilometres (78 miles) off the north coast of Africa and 1,000 kilometres (621 miles) from the Iberian Peninsula. Covering 845.94 square kilometres (326.62 square miles), Lanzarote is the fourth-largest of the islands in the archipelago. With 152,289 inhabitants at the start of 2019, it is the third most populous Canary Island, after Tenerife and Gran Canaria. Located in the centre-west of the island is Timanfaya National Park, one of its main attractions. The island was declared a biosphere reserve by UNESCO in 1993. The island's capital is Arrecife.

The first recorded name for the island, given by Italian-Majorcan cartographer Angelino Dulcert, was Insula de Lanzarotus Marocelus, after the Genoese navigator Lancelotto Malocello, from which the modern name is derived. The island's name in the native Guanche language was Tyterogaka or Tytheroygaka, which may mean "one that is all ochre" (referring to the island's predominant colour).

Lanzarote is located 11 km (7 mi) north-east of Fuerteventura and just over 1 km (5⁄8 mi) from La Graciosa. The dimensions of the island are 60 km (37 mi) from north to south and 25 km (16 mi) from west to east. Lanzarote has 213 kilometres (132 miles) of coastline, of which 10 km (6 mi) are sand, 16.5 km (10 1⁄4 mi) are beach, and the remainder is rocky. Its landscape includes the mountain ranges of Famara (671 metres or 2,201 feet) in the north and Ajaches (608 metres or 1,995 feet) to the south. South of the Famara massif is the El Jable desert, which separates Famara and Montañas del Fuego. The highest peak is Peñas del Chache, rising to 670 metres (2,200 feet) above sea level. The "Tunnel of Atlantis", the largest underwater volcanic tunnel in the world, is part of the Cueva de los Verdes lava tube.

Lanzarote is the northernmost and easternmost island of the Canary Islands and has a volcanic origin. It was born through fiery eruptions and has solidified lava streams as well as extravagant rock formations. The island emerged about 15 million years ago as product of the Canary hotspot. The island, along with others, emerged after the breakup of the African and the American continental plates. The greatest recorded eruptions occurred between 1730 and 1736 in the area now designated Timanfaya National Park.

There are five hundred different kinds of plants on the island, of which 17 species are endemic. These plants have adapted to the relative scarcity of water in the same way as succulents. They include the Canary Island date palm (Phoenix canariensis), which is found in damper areas of the north, the Canary Island pine (Pinus canariensis), ferns, and wild olive trees (Olea europaea). Laurisilva trees, which once covered the highest parts of Risco de Famara, are rarely found today. After winter rainfall, the vegetation comes to a colourful bloom between February and March.

The vineyards of La Gería, Lanzarote DO wine region, are a protected area. Single vines are planted in pits 4–5 metres (13–16 feet) wide and 2–3 metres (6 feet 7 inches–9 feet 10 inches) deep, with small stone walls around each pit. This agricultural technique is designed to harvest rainfall and overnight dew and to protect the plants from the winds.

There are 180 different species of lichen-forming fungi. These survive in the suitable areas like rock surfaces, and promote weathering.

Apart from the native bats and the mammals which accompanied humans to the island (including the dromedary, which was used for agriculture and is now a tourist attraction), there are few vertebrate species on Lanzarote. These include birds (such as falcons) and reptiles. Some interesting endemic animals are the Gallotia lizards and the blind Munidopsis polymorpha crabs found in the Jameos del Agua lagoon, which was formed by a volcanic eruption. The island is also home to one of two surviving populations of the threatened Canarian Egyptian vulture.