威廉王岛（King William Island）是加拿大在北极圈内的一个岛，属努那福特区。该岛面积有13,111平方公里，是全球第61大岛及加拿大第15大岛。2006年有人口1,064人。

Gjoa Haven是岛上唯一的聚居点。

King William Island (previously: King William Land; Inuktitut: Qikiqtaq) is an island in the Kitikmeot Region of Nunavut, which is part of the Canadian Arctic Archipelago. In area it is between 12,516 km (4,832 sq mi) and 13,111 km (5,062 sq mi) making it the 61st-largest island in the world and Canada's 15th-largest island. Its population, as of the 2011 census, was 1,279, all of whom live in the island's only community, Gjoa Haven.