Dahlonega School No. 1 is an historic school building located near Ottumwa, Iowa, United States. It is located in the center of the unincorporated community of Dahlonega. The building was completed in 1921 and served as a school building until 1959. It served as a voting place for the township until 1986. The one-room schoolhouse measures 1,100 square feet (100 m2). The property was listed on the National Register of Historic Places in 2000.