'''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 * Campbell De Morgan (1811–1876), British surgeon * William De Morgan (1839–1917), English designer, potter, ceramics-worker, and novelist * Mary De Morgan (1850–1907), English author of literary fairytales * Evelyn De Morgan (1855–1919), English pre-Raphaelite painter * Jacques de Morgan (1857–1924), French archaeologist
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