Mosquito Lake (Lingít: Xunt’i Áa[4]) is a census-designated place (CDP) in Haines Borough, Alaska, United States.

[6] It is bordered to the south by the Klehini River, to the west by the Canada–United States border from the Pleasant Camp, British Columbia border crossing north to Rozaunt Creek, to the north by Rozaunt Creek, Nataga Creek, and the Kelsall River, and to the east by the Chilkat River.

To the south across the Klehini River is the Covenant Life CDP, and to the west is the Canadian province of British Columbia.

The CDP takes its name from Mosquito Lake, a small water body next to the Chilkat River in the eastern part of the community, accessible by Mosquito Lake Road from the Haines Highway.

[5] Mosquito Lake first reported on the 1990 U.S. Census as a census-designated place (CDP).