Flat Willow Colony is a Hutterite community[4] and census-designated place (CDP) in Musselshell County, Montana, United States.

It is in the northern part of the county, 5 miles (8 km) east of U.S. Route 87 and 25 miles (40 km) north-northeast of Roundup, the Musselshell county seat.

The community was first listed as a CDP prior to the 2020 census, at which time it had a population of 15.

[3] According to the U.S. Census Bureau, the colony has an area of 0.13 square miles (0.34 km2), all land.

This Musselshell County, Montana state location article is a stub.