The 1974 United States Senate election in Oklahoma was held November 3, 1974. Incumbent Republican U.S. Senator Henry Bellmon narrowly won re-election to a second term, beating Representative Ed Edmondson (D-OK) by nearly 4,000 votes. Henry Bellmon was the first Republican United States Senator from Oklahoma ever to win re-election.
In March 1976, Senate Democrats called for Bellmon's seat to be declared vacant and for a new election to be held in Oklahoma. Edmondson had charged that voting irregularities had tipped the election in favor of Bellmon. For example, voting machines in Tulsa County, which had a large population of registered Democrats, had lacked straight party levers.