Reykjavík ( RAYK-yə-vik, -⁠veek; Icelandic: [ˈreiːcaˌviːk] (listen)) is the capital and largest city of Iceland. It is located in southwestern Iceland, on the southern shore of Faxaflói bay. Its latitude is 64°08' N, making it the world's northernmost capital of a sovereign state. Reykjavík has a population of around 140,000 as of 2023 (and 248,000 in the Capital Region).

Reykjavík had a population of 121,822 in 2015. It is the centre of Iceland's cultural, economic, and governmental activity, and is a popular tourist destination among foreigners.

Reykjavík is believed to be the location of the first permanent settlement in Iceland, which, according to Landnámabók, was established by Ingólfr Arnarson in 874 CE. Until the 18th century, there was no urban development in the city location. The city was officially founded in 1786 as a trading town and grew steadily over the following decades, as it transformed into a regional and later national centre of commerce, population, and governmental activities. It is among the cleanest, greenest, and safest cities in the world.