Thousand Lake Mountain, Mountain peak in Wayne County, Utah.

Thousand Lake Mountain is a mountain in northwest Wayne County, Utah, in the easternmost section of Fishlake National Forest, just northwest of Capitol Reef National Park. It rises to 3,441 metres and is covered in boulders, unlike nearby Boulder Mountain, which holds many lakes. A section of the Great Western Trail crosses it from north to south.

The peak received its name from a cartographic error, since the lakes mentioned are actually found on nearby Boulder Mountain instead. This mix-up has remained part of the mountain's geographic name ever since.

Local communities from Loa, Lyman, Fremont, Bicknell, Teasdale, and Torrey use the mountain areas for farming, camping, and outdoor activities.

The best time to hike is from late spring through early fall when snow has melted and trails are passable. Visitors should prepare for changing weather at higher elevations and bring plenty of water and supplies.

The names of Thousand Lake Mountain and neighbouring Boulder Mountain appear to have been swapped: the lakes lie on Boulder Mountain, while Thousand Lake Mountain is the one covered in boulders. The likeliest explanation given is a cartographer who wrote the names he had been given on the wrong hills and did not catch the mistake before the maps were published.