Vestmannaeyjar, sometimes anglicized as Westman Islands, is a municipality and archipelago off the south coast of Iceland.

The largest island, Heimaey, has a population of 4,332, most of whom live in the archipelago's main town, Vestmannaeyjabær. The other islands are uninhabited, although six have single hunting cabins. Vestmannaeyjar came to international attention in 1973 with the eruption of Eldfell volcano, which destroyed many buildings and forced a month-long evacuation of the entire population to mainland Iceland. Approximately one-fifth of the town was destroyed before the lava flow was halted by application of 6.8 billion litres of cold sea water.

There is generally very little snow, but a lot of rain. Owing to this microclimate, returning migrant birds are often first seen in the spring and they set out from the islands in the autumn. All of Iceland's seabirds can be found in Vestmannaeyjar: the guillemot, gannet, kittiwake, Iceland gull, and puffin. The puffin is the most plentiful species and is the Vestmannaeyjar emblem. More than 30 species of birds nest in their millions in the cliffs and grassy ledges, and other species make irregular appearances.

There are about 150 plant species in the flora of the islands, and about 80 types of insect have been identified. The waters around the Vestmannaeyjar contain some of the North Atlantic's richest fishing grounds. The two main commercially exploited species in Iceland, cod and haddock, are found in abundance in Vestmannaeyjar. Other species, such as flat-fish, herring and capelin, are also commonly harvested as they migrate through the area in the autumn and winter. Lobsters and ocean perch are found in large numbers in the deep water to the southeast of the islands. Seals, small types of whale and other marine species are also present in large numbers around the islands.