John Albert Tiffin Hull (May 1, 1841 – September 26, 1928) was a ten-term Republican U.S. Representative from Iowa's 7th congressional district.

He graduated from the Cincinnati Law School in the spring of 1862, was admitted to the bar the same year, and commenced practice in Des Moines, Iowa.

The Fifty-second Congress was unusual for its era, because, for the first time since the Civil War, Iowans had elected more Democrats than Republicans to the U.S. House.

Senator Albert B. Cummins, the leader of the Iowa Republican Party's progressive wing, targeted Hull for defeat, by giving his early endorsement to a progressive adversary, Solomon F. Prouty, whom Hull had defeated in three earlier contests for Republican renomination.

Hull, served as Judge Advocate General (1924–1928) and later as Associate Justice of the Supreme Court of the Philippines (1932–1936).