| Election Name: | 1938 United States Senate election in Arizona |
| Country: | Arizona |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1932 United States Senate election in Arizona |
| Previous Year: | 1932 |
| Next Election: | 1944 United States Senate election in Arizona |
| Next Year: | 1944 |
| Election Date: | November 3, 1938 |
| Nominee1: | Carl Hayden |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 82,714 |
| Percentage1: | 76.52% |
| Nominee2: | Burt H. Clingan |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 25,378 |
| Percentage2: | 23.48% |
| Map Size: | 210px |
| U.S. Senator | |
| Before Election: | Carl Hayden |
| Before Party: | Democratic Party (United States) |
| After Election: | Carl Hayden |
| After Party: | Democratic Party (United States) |
The 1938 United States Senate elections in Arizona took place on November 3, 1938. Incumbent Democratic U.S. Senator Carl Hayden ran for reelection to a third term, defeating Republican nominee Burt H. Clingan in the general election.
In contrast to previous elections, Hayden was easily reelected, receiving only token opposition from a relatively unknown Republican challenger.