米湖（Mývatn）是冰岛北部的一个浅水富营养化湖，面积37平方公里，位于一个活跃的火山区，距离克拉夫拉火山不远。该湖及其周边湿地生活着异常丰富的水鸟，特别是鸭子。约2300年前，玄武岩熔岩大量喷发而形成该湖，周围主要是由火山地貌景观，包括熔岩柱和无根泉。以其为源头的拉赫（Laxá）河以盛产斑鳟（Brown trout）和大西洋鲑鳟（Atlantic Salmon）而出名。

湖名来自冰岛语mý（蚊）和vatn（湖），夏天这里有大量的蚊子。

Mývatn (Icelandic pronunciation: [ˈmiːˌvaʰtn̥]) is a shallow eutrophic lake situated in an area of active volcanism in the north of Iceland, not far from Krafla volcano. The lake and its surrounding wetlands have an exceptionally rich fauna of waterbirds, especially ducks. The lake was created by a large basaltic lava eruption 2300 years ago, and the surrounding landscape is dominated by volcanic landforms, including lava pillars and rootless vents (pseudocraters). The effluent river Laxá is known for its rich fishing for brown trout and Atlantic salmon.