The 1966 United States House of Representatives elections was an election for the United States House of Representatives on November 8, 1966, to elect members to serve in the 90th United States Congress. They occurred in the middle of President Lyndon B. Johnson's second term. As the Vietnam War continued to escalate and race riots exploded in cities across the country, Johnson's popularity had fallen, and the opposition Republican Party was able to gain a net of 47 seats from Johnson's Democratic Party, which nonetheless maintained a clear majority in the House. This was also the first election that occurred after the Voting Rights Act of 1965 became law. Republican gains Alaska's at-large congressional district: four-term Democratic incumbent Ralph Julian Rivers was defeated by Republican State Senator Howard Wallace Pollock. Arizona's 3rd congressional district: sophomore Democrat George F. Senner Jr. was defeated by state legislator Sam Steiger. Arkansas's 3rd congressional district: lumber executive and Arkansas GOP chair John Paul Hammerschmidt defeated incumbent James William Trimble, becoming the first Republican member of Arkansas' congressional delegation since Reconstruction. California's 18th congressional district: onetime Olympic gold medalist Robert B. Mathias defeated seven-term Democratic incumbent Harlan Hagen. California's 25th congressional district: Charles E. Wiggins defeated incumbent Democrat Ronald B. Cameron. California's 33rd congressional district: Jerry L. Pettis defeated incumbent Kenneth W. Dyal. Texas's 7th congressional district: businessman and 1964 U.S. Senate candidate George H. W. Bush defeated Democratic challenger Frank Briscoe for the seat vacated by John V. Dowdy (whose district had been renumbered the second). Texas's 18th congressional district: Bob Price succeeded retiring Democrat Walter Edward Rogers by defeating Dee Miller. Special elections Elections are listed by date and district. |- ! | Herbert Covington Bonner | | Democratic | | | Incumbent died November 7, 1965.New member elected February 5, 1966.Democratic hold.Successor was later re-elected, see below. | nowrap | |- ! | John Lindsay | | Republican | | | Incumbent resigned December 31, 1965 to become Mayor of New York City.New member elected February 8, 1966.Republican hold.Successor was later re-elected, see below. | nowrap | |- ! | Albert Thomas | | Democratic | | | Incumbent died February 15, 1966.New member elected March 26, 1966.Democratic hold.Successor did not seek re-election in November, see below. | nowrap | |- ! | John F. Baldwin Jr. | | Republican | | | Incumbent died March 9, 1966.New member elected June 7,