William Pitt Durfee (5 February 1855 – 17 December 1941) was an American mathematician who introduced Durfee squares. He was a student of James Sylvester, and after obtaining his degree in 1883 he became a professor at Hobart college in 1884 and became dean in 1888. Durfee House and Durfee Hall are named in his honor.

• Durfee, William P. (1900), The elements of plane trigonometry, Ginn & co.

• Parshall, Karen Hunger; Rowe, David E. (1994), The emergence of the American mathematical research community, 1876–1900: J. J. Sylvester, Felix Klein, and E. H. Moore, History of Mathematics, vol. 8, Providence, R.I.: American Mathematical Society, ISBN 978-0-8218-9004-2, MR 1290994
• Parshall, Karen Hunger (2005), "The emergence of the American Mathematical research community", in Kinyon, Michael; Van Brummelen, Glen (eds.), Mathematics and the historian's craft, CMS Books in Mathematics/Ouvrages de Mathématiques de la SMC, 21, Berlin, New York: Springer-Verlag, p. 191, doi:10.1007/0-387-28272-6, ISBN 978-0-387-25284-1, MR 2156756
• William Pitt Durfee at the Mathematics Genealogy Project
• Who Was Who in America: with World Notables. Volume 1, by Marquis Who's Who, 1942.

• Biography on HWS website
• Durfee House on HWS website
• William Pitt Durfee at the Mathematics Genealogy Project