Hezekiah Lord Hosmer (June 7, 1765 – June 9, 1814) was a United States representative from New York.

Hosmer came from a prominent family; his father Titus Hosmer signed the Articles of Confederation for Connecticut, and Hosmer's brother Stephen became the Chief Justice of the Connecticut Supreme Court.

Hezekiah studied law and was admitted to practice in the mayor's court of Hudson, New York.

Hosmer married Susan Throop on November 30, 1805; they had 5 children including several who died in infancy.

His posthumous son Hezekiah Lord Hosmer (1814–1893) was an author and the first Chief Justice of the Montana Territorial Court.