The Nathan Clifford School is a former elementary school building at 180 Falmouth Street in Portland, Maine. Built in 1907–09 to a design by John Calvin Stevens and his son , it was hailed as a model elementary school by the state, built with up-to-date technology to the latest standards. It was named for Maine politician and jurist Nathan Clifford. The school was closed in 2011, and has been converted to residential use.