| Election Name: | 1964 United States Senate election in Arizona |
| Country: | Arizona |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1958 United States Senate election in Arizona |
| Previous Year: | 1958 |
| Next Election: | 1970 United States Senate election in Arizona |
| Next Year: | 1970 |
| Election Date: | November 3, 1964 |
| Image1: | File:Paul Fannin.jpg |
| Nominee1: | Paul Fannin |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 241,089 |
| Percentage1: | 51.43% |
| Nominee2: | Roy Elson |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 227,712 |
| Percentage2: | 48.57% |
| Map Size: | 210px |
| U.S. Senator | |
| Before Election: | Barry Goldwater |
| Before Party: | Republican Party (United States) |
| After Election: | Paul Fannin |
| After Party: | Republican Party (United States) |
The 1964 United States Senate election in Arizona took place on November 3, 1964. Incumbent Republican U.S. Senator Barry Goldwater decided not to run for reelection to a third term, instead running for President of the United States as the Republican Party nominee against Lyndon B. Johnson.[1] Arizona Governor Paul Fannin ran unopposed in the Republican primary, and defeated Democratic nominee Roy Elson, who was a staff member for U.S. Senator Carl Hayden until Hayden's retirement in 1969, after which Goldwater held that seat from 1969 to 1987.
Despite a landslide loss throughout the country, and Goldwater only able to obtain 50.45% of the vote in his home state of Arizona, Fannin managed to prevail in the state's Senate election.