Steven Arnold King (born May 28, 1949) is an American former politician and businessman who served as a U.S. representative from Iowa from 2003 to 2021. A member of the Republican Party, he represented Iowa's 5th congressional district until 2013 and the state's 4th congressional district from 2013 to 2021.

Born in 1949 in Storm Lake, Iowa, King attended Northwest Missouri State University from 1967 to 1970. He founded a construction company in 1975 and worked in business and environmental study before seeking the Republican nomination for a seat in the Iowa Senate in 1996. He won the primary and the general election, and was reelected in 2000. In 2002 King was elected to the U.S. House of Representatives from Iowa's 5th congressional district after the incumbent, Tom Latham, was reassigned to the 4th district after redistricting. He was reelected four times before the 2010 United States census removed the 5th district and placed King in the 4th, which he represented from 2013.

King is an opponent of immigration and multiculturalism, and has a long history of racist and anti-immigrant rhetoric. In 2018 The Washington Post described King as "the Congressman most openly affiliated with white nationalism." King has been criticized for his affiliation with white supremacist ideas, made controversial statements against immigrants, and supported European right-wing populist and far-right politicians who have engaged in racism, anti-Semitism and Islamophobia.

For much of King's congressional tenure, Republican politicians and officials were silent about his rhetoric, and frequently sought his endorsement and campaigned with him because of his popularity with northwest Iowa's voters. Shortly before the 2018 election, the National Republican Congressional Committee withdrew funding for King's reelection campaign and its chairman, Steve Stivers, condemned King's conduct, although Iowa's Republican senators and governor continued to endorse him. King was narrowly reelected, but after a January 2019 interview in which he questioned the negative connotations of the terms "white nationalist" and "white supremacy", he was widely condemned by both parties, the media, and public figures, and the Republican Steering Committee removed him from all House committee assignments. King ran for reelection but, campaign funding and support having declined, lost the June 2020 Republican primary to Randy Feenstra by 10 points.

King was born on May 28, 1949, in Storm Lake, Iowa, the son of Mildred Lila (née Culler), a homemaker, and Emmett A. King, a state police dispatcher. His father has Irish and German ancestry, and his mother has Welsh roots, as well as American ancestry going back to the colonial era. His grandmother was a German immigrant. King graduated in 1967 from Denison Community High School. In 1972, he married Marilyn Kelly, with whom he has three children. Though raised Methodist, King attends his wife's Catholic church, having converted 17 years after marrying her. His son Jeff King, a consultant, has been active in his political campaigns.

King attended Northwest Missouri State University from 1967 to 1970, where he was a member of the Alpha Kappa Lambda fraternity and majored in math and biology, but did not graduate. In 1975, King founded King Construction, an earthmoving company. In the 1980s, he founded the Kiron Business Association. King's involvement with the Iowa Land Improvement Contractors' Association led to regional and national offices in that organization and a growing interest in public policy.

In 1996, King was elected to Iowa's 6th Senate district, defeating incumbent senator Wayne Bennett in the primary 68%–31% and Democrat Eileen Heiden in the general election 64%–35%. In 2000, he won reelection to a second term, defeating Democratic nominee Dennis Ryan 70%–30%. During his tenure in the Iowa State Senate, King filed a bill requiring public schools to teach children that the U.S. "is the unchallenged greatest nation in the world and that it has derived its strength from... Christianity, free enterprise capitalism and Western civilization", and served as chief sponsor of a law making English the official language of Iowa.

In 2002, after redistricting, King ran for the open seat in Iowa's 5th congressional district. The incumbent, fellow Republican Tom Latham, had his home drawn into the reconfigured 4th district. King finished first in the four-way Republican primary with 31% of the vote, less than the 35% voting threshold needed to win; subsequently, a nominating convention was held, at which he was nominated, defeating state house speaker Brent Siegrist 51%–47%. King won the general election, defeating Council Bluffs city councilman Paul Shomshor 62%–38%. He won all the counties in the predominantly Republican district except Pottawattamie.