Olathe is a statutory town in Montrose County, Colorado, United States. The population was 2,019 as of the 2020 census, up from 1,849 at the 2010 census. A post office called Olathe has been in operation since 1896. The community was named after Olathe, Kansas.

The Uncompahgre River is a tributary of the Gunnison River, approximately 75 mi (121 km) long, in southwestern Colorado in the United States. Lake Como at 12,215 ft (3723m) in northern San Juan County, in the Uncompahgre National Forest in the northwestern San Juan Mountains is the headwaters of the river. It flows northwest past Ouray, Ridgway, Montrose, and Olathe and joins the Gunnison at Confluence Park in Delta.