De Morgan is a surname, and may refer to:
Augustus De Morgan (1806–1871), mathematician and logician.
De Morgan's laws (or De Morgan's theorem), a set of rules from propositional logic.
The De Morgan Medal, a triennial mathematics prize awarded by the London Mathematical Society.
William De Morgan (1839–1917), designer, potter, ceramics-worker (tilist), novelist, and son of Augustus de Morgan
Evelyn De Morgan (1855–1919), an English pre-Raphaelite painter and wife of William de Morgan.
Jacques de Morgan (1857–1924), archaeologist
