Irving L'Hommedieu (January 12, 1865 in Shelby, Orleans County, New York – July 14, 1931 in Medina, Orleans Co., NY) was an American lawyer and politician from New York.
He was the son of Assemblyman Wallace L'Hommedieu (1833–1916) and Frances Marion (Berry) L'Hommedieu (1838–1895). He attended the common schools, Medina Free Academy and Albany Law School. He studied law with Edmund L. Pitts, was admitted to the bar in 1886, and practiced in Medina. He married Christina Breed (1864–1922).
L'Hommedieu was a member of the New York State Republican Committee from 1898 to 1902; Postmaster of Medina from 1899 to 1902; and a member of the New York State Senate (45th D.) from 1903 to 1906, sitting in the 126th, 127th, 128th and 129th New York State Legislatures.
He married Carolyn Elizabeth Mitchell (divorced Dodd) (1881–1951).
He died on July 14, 1931, in Medina; and was buried at the Boxwood Cemetery there.