John Henry Kyl was an American politician who served as a member of the United States House of Representatives, representing Iowa's 4th congressional district from 1959 to 1965 and again from 1967 to 1973. He was a member of the Republican Party.

Iowa's 4th congressional district is a congressional district in the U.S. state of Iowa that covers the western border of the state, including Sioux City and Council Bluffs. Up north, it extends eastwards into Ames, Boone, Fort Dodge, and Marshalltown. It has been represented by Republican Randy Feenstra since 2021, who defeated longtime incumbent Steve King in 2020. With a Cook Partisan Voting Index rating of R+16, it is the most Republican district in Iowa, a state with an all-Republican congressional delegation.