Clarno is a town in Green County, Wisconsin, United States.

According to the United States Census Bureau, the town has a total area of 36.5 square miles (94.6 km2), all of it land.

The town was named after early settler Andrew Clarno, who founded a farm there in 1829.

The racial makeup of the town was 98.70% White, 0.09% African American, 0.37% Asian, and 0.83% from two or more races.

16.5% of all households were made up of individuals, and 5.6% had someone living alone who was 65 years of age or older.