Semon may refer to:
Charles Semon (1814–1877), German and British businessman, politician and philanthropist Felix Semon (1841–1921), German neurobiologist and laryngologist Henry Semon (1884–1958), American farmer, businessman, and politician Larry Semon (1889–1928), American actor, director, producer, and screenwriter during the silent film era Mo Chuaroc moccu Neth Semon (fl. c. 600?), an Irish monk and scholar of the Early Middle Ages Richard Semon (1859–1918), German zoologist and evolutionary biologist Waldo Semon (1898–1999), American inventor born in Demopolis, Alabama
See also Semon's Leaf-nosed Bat, species of bat in the family Hipposideridae, found in Australia and Papua New Guinea Semon Knudsen (1912–1998), prominent automobile executive