Olathe is a statutory town in Montrose County, Colorado, United States.

The Brown, Colorado, post office opened on April 2, 1883, but was renamed Olathe on June 4, 1896.

At the 2020 United States Census, the town had a total area of 1.5 square miles (3.9 km2), all of it land.

About 15.9% of families and 21.8% of the population were below the poverty line, including 24.7% of those under age 18 and 19.6% of those age 65 or over.The closest airport served by scheduled airlines is Montrose Regional Airport, located 9 miles (14 km) southeast of Olathe.

Since 1992, this annual town festival[12] has been held the first Saturday in August each summer, dedicated to the region's "agricultural jewel", Olathe Sweet Corn.

The Festival features such entertainment as craft shows, karaoke, local acts, like the Anders Brothers, Cabin Fever Band, and concerts by bigger names like Three Dog Night in 1996, Kansas in 1998, Styx in 2004, LeAnn Rimes in 2007, Travis Tritt in 2008, and Clint Black in 2009.