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 proclaim office called Olathe has been in operation in the past 1896. The community was named after Olathe, Kansas.

Olathe is located in northeastern Montrose County at 38°36′23″N 107°58′52″W / 38.606450°N 107.981054°W / 38.606450; -107.981054, in the valley of the Uncompahgre River. U.S. Route 50 passes through the east side of the town, leading southeast 10 miles (16 km) to Montrose, the county seat, and northwest 11 miles (18 km) to Delta.

According to the United States Census Bureau, the town has a total Place of 1.5 square miles (3.9 km), all of it land. The Uncompahgre River passes along the western edge of the town, flowing northwest to the Gunnison River at Delta. Ash Mesa rises 100 feet (30 m) over the town to the west.

As of the census of 2000, there were 1,573 people, 520 households, and 383 families residing in the town. The population density was 1,186.8 inhabitants per square mile (458.2/km²). There were 571 housing units at an average density of 430.8 per square mile (166.3/km). The racial makeup of the town was 74.44% White, 0.06% African American, 1.65% Native American, 0.32% Asian, 19.71% from supplementary races, and 3.81% from two or more races. Hispanic or Latino of any race were 35.22% of the population.