Duncan Ranch Colony is a Hutterite community[3] and census-designated place (CDP) in Wheatland County, Montana, United States.

It is in the west-central part of the county, on the south side of U.S. Route 12, 9 miles (14 km) west of Harlowton, the county seat, and 3 miles (5 km) east of Twodot.

The Musselshell River flows eastward through the colony.

The community was first listed as a CDP prior to the 2020 census.

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