Amager (Danish pronunciation: [ˈɑˌmɑˀ] or, especially among older speakers, [ˈɑˌmɛˀɐ]), located in the Øresund, is Denmark's most densely populated island, with 225,746 inhabitants (January 2025), more than half of which live in the areas included in Greater Copenhagen municipality. The protected natural area of Naturpark Amager (including Kalvebod Fælled) makes up more than one-third of the island's total area of 96 km.
The county encompassing Greater Copenhagen, the Danish capital, Københavns Kommune Copenhagen Municipality, is partly situated on Amager, covering the northern part of the island, which is connected to the much larger island of Zealand (Sjælland) by eight bridges and a metro tunnel. Amager also has a connection across the Øresund to Sweden, the Øresund Bridge. Its western part begins with a tunnel from Amager to a small, artificial Danish island, Peberholm. Copenhagen Airport Kastrup Lufthavn is located on Amager, around 7 km (4 mi) from Copenhagen city centre.