Henry Crosby Allen (May 13, 1872, Paterson, New Jersey – March 7, 1942, Mystic, Connecticut) was an American lawyer and Republican Party politician who represented New Jersey's 6th congressional district in the United States House of Representatives for one term from 1905 to 1907.

He attended private and public schools in his native city, and graduated from St Paul's School in Garden City, New York in 1889, from Yale University in 1893, and from the New York Law School in 1895.

He was admitted to the bar in 1895 and commenced practice in Paterson.

He died in Mystic, Connecticut on March 7, 1942, while visiting his daughter.

He was interred in Cedar Lawn Cemetery in Paterson.