Clarissa is a city in Todd County, Minnesota, United States. The population was 681 at the 2010 census.
According to the United States Census Bureau, the city has a total area of 1.0 square miles (2.6 km²), all of it land.
As of the census of 2000, there were 609 people, 256 households, and 142 families residing in the city. The population density was 617.0 people per square mile (237.5/km²). There were 292 housing units at an average density of 295.9 per square mile (113.9/km²). The racial makeup of the city was 98.03% White, 0.16% African American, 0.49% Native American, 0.49% Asian, and 0.82% from two or more races. Hispanic or Latino of any race were 0.99% of the population.