| Election Name: | 1946 United States Senate election in Arizona |
| Country: | Arizona |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1940 United States Senate election in Arizona |
| Previous Year: | 1940 |
| Next Election: | 1952 United States Senate election in Arizona |
| Next Year: | 1952 |
| Election Date: | November 5, 1946 |
| Nominee1: | Ernest McFarland |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 80,415 |
| Percentage1: | 69.18% |
| Nominee2: | Ward S. Powers |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 35,022 |
| Percentage2: | 30.13% |
| Map Size: | 210px |
| U.S. Senator | |
| Before Election: | Ernest McFarland |
| Before Party: | Democratic Party (United States) |
| After Election: | Ernest McFarland |
| After Party: | Democratic Party (United States) |
The 1946 United States Senate elections in Arizona took place on November 5, 1946. Incumbent Democratic U.S. Senator Ernest McFarland ran for reelection to a second term, easily defeating his Republican challenger Ward S. Powers in the general election.