Ronan is a city in Lake County, Montana, United States. It lies on the Flathead Indian Reservation about 12 miles south of Flathead Lake in the northwestern part of the state. The population was 1,812 at the 2000 census.
Ronan is located at 47°31′40″N 114°6′1″W / 47.52778°N 114.10028°W / 47.52778; -114.10028 (47.527758, -114.100189).
According to the United States Census Bureau, the city has a total area of 1.1 square miles (2.7 km²), all of it land.