| Election Name: | 1970 United States Senate election in Arizona |
| Country: | Arizona |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1964 United States Senate election in Arizona |
| Previous Year: | 1964 |
| Next Election: | 1976 United States Senate election in Arizona |
| Next Year: | 1976 |
| Election Date: | November 3, 1970 |
| Image1: | Paul Fannin.jpg |
| Nominee1: | Paul Fannin |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 228,284 |
| Percentage1: | 55.98% |
| Nominee2: | Sam Grossman |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 179,512 |
| Percentage2: | 44.02% |
| Map Size: | 210px |
| U.S. Senator | |
| Before Election: | Paul Fannin |
| Before Party: | Republican Party (United States) |
| After Election: | Paul Fannin |
| After Party: | Republican Party (United States) |
The 1970 United States Senate election in Arizona took place on November 3, 1970. Incumbent Republican U.S. Senator Paul Fannin decided to run for reelection to a second term, running unopposed in the Republican primary. Fannin defeated Democratic nominee Sam Grossman in the general election. This was the last time until 1994 that Republicans won Arizona's Class 1 Senate Seat.