| Official Name: | Duncan Ranch Colony, Montana |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Montana#USA |
| Pushpin Label: | Duncan Ranch Colony |
| Coordinates: | 46.4444°N -110.0239°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Montana |
| Subdivision Type2: | County |
| Subdivision Name2: | Wheatland |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 0.60 |
| Area Land Sq Mi: | 0.60 |
| Area Water Sq Mi: | 0.00 |
| Area Total Km2: | 1.57 |
| Area Land Km2: | 1.57 |
| Area Water Km2: | 0.00 |
| Population As Of: | 2020 |
| Population Density Km2: | 4.47 |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Elevation Ft: | 4350 |
| Postal Code Type: | ZIP Codes |
| Postal Code: | 59036 (Harlowton) 59085 (Two Dot) |
| Area Code: | 406 |
| Blank Name: | FIPS code |
| Blank Info: | 30-22130 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2804317 |
| Population Total: | 7 |
| Unit Pref: | Imperial |
| Population Density Sq Mi: | 11.57 |
Duncan Ranch Colony is a Hutterite community[2] 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, 9miles west of Harlowton, the county seat, and 3miles east of Twodot. The Musselshell River flows eastward through the colony.
The community was first listed as a CDP prior to the 2020 census.
It is zoned to Harlowton Public Schools.[3]