Heman Allen may refer to:
Heman Allen (of Cornwall) (1740–1778), Vermont patriot and brother of Ethan Allen Heman Allen (diplomat) (1779–1852), U.S. Representative from Colchester, Vermont (1817–1818), U.S. Minister Plenipotentiary to Chile Heman Allen (Vermont politician) (1777–1844), U.S. Representative from Milton, Vermont (1831–1839)
See also Heman Allen Moore (1809–1844), U.S. Representative from Ohio