Waldo Semon (1898–1999), renowned American inventor born in Demopolis, Alabama
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Richard Semon (1859–1918), German zoologist and evolutionary biologist
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Larry Semon (1889–1928), American actor, director, producer, and screenwriter during the silent film era
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Mo Chuaroc moccu Neth Semon (fl. c. 600?), an Irish monk and scholar of the Early Middle Ages
Waldo Semon | Richard Semon | Mo Chuaroc moccu Neth Semon | Larry Semon |
In 1918 in Munich, Semon committed suicide wrapped in a German flag allegedly because he was depressed by Germany's defeat after World War I.
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Semon's book Die Mneme directly influenced the Mnemosyne project of the idiosyncratic art historian Aby Warburg.