Nolfo da Montefeltro (born Sighinolfo; c. 1290 – 1364) was count of Montefeltro from 1323 to 1360. He was the son of Federico I da Montefeltro, who had been slain by the people of the city in revolt against him. In 1323 Nolfo, now a leader of the Ghibelline part in the Marche, reconquered the city by defeating the Papal commander, Ferrantino Malatesta. His first move as lord was the assassination of all his father's enemies. After signing a treaty of peace, he was made Papal vicar in his lands. Nolfo died in 1364.