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.

Randall Lee Feenstra is an American politician and businessman serving as the U.S. representative for Iowa's 4th congressional district. The district covers the western border of the state, including Sioux City and Council Bluffs, but stretches as far east as Story County, Franklin County, and Marshall County, including Ames.