Onion Lake Cree Nation, comprising the adjacent Makaoo 120 and Seekaskootch 119 Indian reserves, is a Cree First Nation band government in Canada that straddles the Alberta/Saskatchewan provincial border approximately 50 km (31 mi) north of the City of Lloydminster.
It is within Alberta's County of Vermilion River and Saskatchewan's Rural Municipality of Frenchman Butte No. 501 at the intersection of Highway 17 and Alberta Highway 641/Saskatchewan Highway 797.
The Makaoo 120 reserve is located within both provinces while the Seekaskootch 119 reserve is wholly within Saskatchewan. With the two reserves combined, the Onion Lake Cree Nation has a total land mass of 21,254.6 hectares (52,521 acres), and has 5350 registered First Nations members (as of December, 2012).
Onion Lake takes its name after the nearby Onion Lake in Saskatchewan located at coordinates 53°43′11″N 109°53′33″W / 53.71972°N 109.89250°W.
The Onion Lake Cree Nation has four schools within the community, one of which is a Cree immersion program.
The unincorporated area of Onion Lake is located within the Saskatchewan portion of the Onion Lake Cree Nation at the intersection of Highway 17 and Alberta Highway 641/Saskatchewan Highway 797.