Warren is a city in and the county seat of Marshall County, Minnesota, United States. The population was 1,563 at the 2010 census.
U.S. Route 75 and Minnesota Highway 1 are two of the main arterial routes in the city.
According to the United States Census Bureau, the city has a total area of 1.4 square miles (3.7 km²). 1.4 square miles (3.7 km²) of it is land and none of it is covered by surface water. The Snake River flows in serpentine fashion through the city (hence its name), and there is development on both banks. This has proved problematic as the city attempts flood control. Some major floods in the city's history occurred in 1896 (twice), 1969, 1974, 1979, 1996 (twice), and 1997.