De Morgan or de Morgan is a surname, and may refer to:
- Augustus De Morgan (1806–1871), British 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), English designer, potter, ceramics-worker, and novelist.
- Evelyn De Morgan (1855–1919), English pre-Raphaelite painter.
- Jacques de Morgan (1857–1924), French archaeologist.
This page lists people with the surname De Morgan.
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If an internal link intending to refer to a specific person led you to this page, you may wish to change that link by adding the person's given name(s) to the link.