Themison () may refer to:
Themison of Eretria, 4th-century BC tyrant of Eretria Themison of Laodicea, 1st-century BC Greek physician Themison of Samos, 4th-century BC admiral Themison of Thera, merchant ordered by King Etearchus to throw the latter's daughter into the sea, but rescued her instead Themison of Cyprus, king of Keryneia