Hayden Lake is a city in Kootenai County, Idaho, United States. Located in the northern portion of the state, it is considered a suburb of the city of Coeur d'Alene. Its population was 574 at the 2010 census. The city was named after the nearby Lake Hayden, which is now more commonly also known as Hayden Lake, after the city.

Kootenai County is located in the U.S. state of Idaho. As of the 2020 census, its population was 171,362, making it the third-most populous county in Idaho and by far the largest in North Idaho, the county accounting for 45.4% of the region's total population. The county seat and largest city is Coeur d'Alene. The county was established in 1864 and named after the Kootenai tribe.