Leonhardi is a surname. Notable people with the surname include:
Eduard Leonhardi (1828–1905), German painter Johann Gottfried Leonhardi (1746–1823), German physician and chemist Moritz von Leonhardi (1856–1910), German anthropologist
See also Aristotelia leonhardi, a moth of the family Gelechiidae Monopeltis leonhardi (Kalahari worm lizard), a worm lizard species in the family Amphisbaenidae Leonardi (disambiguation)