Five members of the U.S. House of Representatives were elected in special elections in 1973.
|District||Vacator||Reason for change||Successor||Date of successor's|
|Illinois 7th||Vacant||Rep. George W. Collins (D) died during previous congress. Democratic hold.||Cardiss Collins (D)||June 5, 1973|
|Alaska at-large||Nick Begich (D)||Lost in a plane crash and declared dead pursuant to H.Res. 1 on January 3, 1973.
New member elected March 6, 1973. Republican gain.
|Don Young||March 6, 1973|
|Louisiana 2nd||Hale Boggs (D)||Lost in a plane crash and declared dead pursuant to H.Res. 1 on January 3, 1973. Democratic hold.||Lindy Boggs (D)||March 20, 1973|
|Maryland 1st||William Mills (R)||Committed suicide May 24, 1973. Republican hold.||Robert Bauman (R)||August 21, 1973|