| Election Name: | 1964 United States Senate special election in Oklahoma |
| Country: | Oklahoma |
| Flag Image: | Flag of Oklahoma (1941–1988).svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1960 United States Senate election in Oklahoma |
| Previous Year: | 1960 |
| Next Election: | 1966 United States Senate election in Oklahoma |
| Next Year: | 1966 |
| Election Date: | November 3, 1964 |
| Image1: | File:FredRoyHarris.jpg |
| Nominee1: | Fred R. Harris |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 466,782 |
| Percentage1: | 51.17% |
| Nominee2: | Bud Wilkinson |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 445,392 |
| Percentage2: | 48.83% |
| U.S. Senator | |
| Before Election: | J. Howard Edmondson |
| Before Party: | Democratic Party (United States) |
| After Election: | Fred R. Harris |
| After Party: | Democratic Party (United States) |
The 1964 United States Senate special election in Oklahoma took place on November 3, 1964. Democratic Senator Robert S. Kerr, who won re-election to his third term in 1960, died in office on January 1, 1963. Governor J. Howard Edmondson resigned from office so that his Lieutenant Governor, George Nigh, could appoint him to the U.S. Senate. Edmondson ran for election in the ensuing special election, and faced strong competition from former Governor Raymond D. Gary and State Senator Fred R. Harris. Edmondson placed first in the primary, but failed to win a majority, with Harris narrowly beating out Gary for second place. In the runoff, Harris defeated Edmondson in a landslide. In the general election, Harris faced former Oklahoma Sooners football coach Bud Wilkinson, the Republican nominee. Even though President Lyndon B. Johnson won Oklahoma by a wide margin over Republican presidential nominee Barry Goldwater, the Senate race was much closer. Ultimately, Harris only narrowly defeated Wilkinson by just 2% of the vote.