Francis Preserved Leavenworth was an American astronomer. He discovered many New General Catalogue objects together with Frank Muller and Ormond Stone. They used a telescope with a 66-cm aperture at the Leander McCormick Observatory at the University of Virginia in Charlottesville, Virginia. He later became Professor of Astronomy at the University of Minnesota in 1892 and was given the title Professor Emeritus when he retired 35 years later.