Glen Haven is an unincorporated community and a U.S. Post Office in Larimer County, Colorado, United States.

Situated in Roosevelt National Forest east of Rocky Mountain National Park, Fox Creek and West Creek join the North Fork Big Thompson River near downtown Glen Haven, which then flows through Devil's Gulch, receiving Miller Fork, and joins the Big Thompson River at Drake.

[3] In the early 1890s, the Knapp family from Illinois built a sawmill near Harding Heights, then moved it first to Miller Fork and then to the point now known as Glen Haven in 1897.

The Boulder Presbytery, with assistance from the Knapp family, formed an association in 1903 and sold lots for a summer resort called Glen Haven.

The Homestead became known as the Inn at Glen Haven and was mentioned in a Los Angeles Times travel article in 1986.