Poplar is a town in Roosevelt County, Montana, United States. The population was 810 at the 2010 census.
Poplar is located at 48°6′34″N 105°11′42″W / 48.10944°N 105.195°W / 48.10944; -105.195 (48.109474, -105.194891).
According to the United States Census Bureau, the town has a total area of 0.3 square miles (0.7 km²), all of it land. It is referred to locally as Stab City, as there is a high instance of stabbings.