Died May 25, 1956.Successor elected November 6, 1956. | nowrap | Kathryn E. Granahan (D) | November 6, 1956 |- | | nowrap| John Carl Hinshaw (R) | Died August 5, 1956.Seat remained unfilled until next term. | colspan=2 | Vacant |- | | nowrap| Percy Priest (D) | Died October 12, 1956.Seat remained unfilled until next term. | colspan=2 | Vacant |- | | nowrap| Antonio M. Fernández (D) | Died November 7, 1956.Seat remained unfilled until next term. | colspan=2 | Vacant |- | | nowrap| T. Millet Hand (R) | Died December 26, 1956.Seat remained unfilled until next term. | colspan=2 | Vacant |- | | nowrap| Arthur George Klein (D) | Resigned December 31, 1956 after being elected to the New York Supreme Court.Seat remained unfilled until next term. | colspan=2 | Vacant |- | | nowrap| Irwin D. Davidson (DL) | Resigned December 31, 1956.Seat remained unfilled until next term. | colspan=2 | Vacant |} Committees Senate Agriculture and Forestry (Chairman: Allen J. Ellender; Ranking Member: George D. Aiken) Appropriations (Chairman: Carl Hayden; Ranking Member: Styles Bridges) Armed Services (Chairman: Richard B. Russell; Ranking Member: Styles Bridges) Banking and Currency (Chairman: J. William Fulbright; Ranking Member: Homer Capehart) Contribution Investigation (Select) District of Columbia (Chairman: Matthew M. Neely; Ranking Member: J. Glenn Beall) Finance (Chairman: Harry F. Byrd; Ranking Member: Eugene D. Millikin) Foreign Relations (Chairman: Walter F. George; Ranking Member: Alexander Wiley) Foreign Aid Program (Special) Government Operations (Chairman: John Little McClellan; Ranking Member: Joseph McCarthy) Interior and Insular Affairs (Chairman: James E. Murray; Ranking Member: Eugene D. Millikin) Interstate and Foreign Commerce (Chairman: Warren G. Magnuson; Ranking Member: John W. Bricker) Judiciary (Chairman: Harley M. Kilgore; Ranking Member: Alexander Wiley) Labor and Public Welfare (Chairman: J. Lister Hill; Ranking Member: H. Alexander Smith) Political Activities, Lobbying and Campaign Contributions (Special) Post Office and Civil Service (Chairman: Olin D. Johnston; Ranking Member: Frank Carlson) Public Works (Chairman: Dennis Chavez; Ranking Member: Edward Martin) Rules and Administration (Chairman: Theodore F. Green; Ranking Member: William E. Jenner) Senate Reception Room (Special) (Chairman: ; Ranking Member: ) Small Business (Select) (Chairman: John J. Sparkman) Whole House of Representatives Agriculture (Chairman: Harold D. Cooley; Ranking Member: Clifford R. Hope) Appropriations (Chairman: Clarence Cannon; Ranking Member: John Taber) Armed Services (Chairman: Carl Vinson; Ranking Member: Dewey J. Short) Banking and Currency (Chairman: Brent Spence; Ranking Member: Jesse P. Wolcott)