94th United States Congress Changes in membership Senate

| State_class | Vacator | Reason_for_change | Successor | Date_of_successor_s_formal_installation_ |
|---|---|---|---|---|
| New Hampshire , (3) | Vacant | Disputed election. Norris Cotton appointed to seat until special election resolved dispute. | Norris Cotton , (R) | August 8, 1975 |
| New Hampshire , (3) | Norris Cotton , (R) | Successor elected September 18, 1975 | John A. Durkin , (D) | September 18, 1975 |
| Michigan , (1) | Philip Hart , (D) | Died December 26, 1976 | Donald W. Riegle, Jr. , (D) | December 27, 1976 |
| Missouri , (1) | Stuart Symington , (D) | Resigned December 27, 1976 | John Danforth , (R) | December 27, 1976 |