Donald S. Chisum (born 1944) is an American legal scholar specialized in patent law. His well-known, multi-volume treatise Chisum on Patents was first published in 1978.
Chisum earned a Bachelor of Arts and Juris Doctor from Stanford University.
From 1969 to 1996, Chisum worked as a professor of law at the University of Washington School of Law. From 1997 to 2006, he was a professor of law at the Santa Clara University School of Law.