United States Senate elections, 1968

Democratic hold

1. Alabama: J. Lister Hill (D) was replaced by James Allen (D).

Democratic gain

1. Iowa: Bourke B. Hickenlooper (R) was replaced by Harold Hughes (D).

Republican holds

1. Kansas: Frank Carlson (R) was replaced by Bob Dole (R).
2. Kentucky: Thruston Ballard Morton (R) was replaced by Marlow W. Cook (R).

Republican gains

1. Arizona: Carl Hayden (D) was replaced by Barry Goldwater (R), who gave up Arizona's other Senate seat in 1964 to run for president.
2. Florida: George Smathers (D) was replaced by Edward J. Gurney (R), the first Republican to represent Florida in the U.S. Senate since Reconstruction.

Democratic holds

1. Alaska: Ernest Gruening (D) lost renomination to Mike Gravel (D), who later won the general election.
2. Missouri: Edward V. Long (D) lost renomination to Thomas Eagleton (D), who later won the general election.

Democratic gain

1. California: Thomas Kuchel (R) lost renomination to Max Rafferty (R), who later lost the general election to Alan Cranston (D).

Republican gains

1. Maryland: Daniel Brewster (D) lost re-election to Charles Mathias, Jr. (R)
2. Ohio: Frank J. Lausche (D) lost renomination to John J. Gilligan (D), who later lost the general election to William B. Saxbe (R).
3. Oklahoma: A. S. Mike Monroney (D), lost re-election to Henry Bellmon (R).
4. Oregon: Wayne Morse (D), lost re-election to Bob Packwood (R).
5. Pennsylvania: Joseph S. Clark (D), lost re-election to Richard Schweiker (R).

Republican gain

1. Alaska: Bob Bartlett (D) died December 11, 1968 and Ted Stevens (R) was appointed December 24, 1968.

Complete list of races

A bolded state name indicates an article about that state's election.

All seats were class 3.