Joseph Linus Barton (born September 15, 1949) is an American politician who represented Texas's 6th congressional district in the U.S. House of Representatives from 1985 to 2019. The district included Arlington, part of Fort Worth, and several small towns and rural areas south of the Dallas–Fort Worth Metroplex. He was also a member of the Tea Party Caucus. In 2014, Barton became the longest-serving member of the Texas congressional delegation.