| Election Name: | 1938 U.S. Senate election in Arkansas |
| Country: | Arkansas |
| Flag Year: | 1924 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1932 United States Senate election in Arkansas |
| Previous Year: | 1932 |
| Next Election: | 1944 United States Senate election in Arkansas |
| Next Year: | 1944 |
| Election Date: | November 8, 1938 |
| Image1: | File:Senator hcaraway.jpg |
| Nominee1: | Hattie Caraway |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 122,883 |
| Percentage1: | 89.58% |
| Nominee2: | C. D. Atkinson |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 14,290 |
| Percentage2: | 10.42% |
| Map Size: | 210px |
| U.S. Senator | |
| Before Election: | Hattie Caraway |
| Before Party: | Democratic Party (United States) |
| After Election: | Hattie Caraway |
| After Party: | Democratic Party (United States) |
The 1938 United States Senate election in Arkansas took place on November 8, 1938. Incumbent Senator Hattie Caraway ran for a second term in office. After narrowly defeating U.S. Representative John Little McClellan in the Democratic primary, she easily won the general election over Republican C.D. Atkinson.
Caraway, already the first woman elected to the U.S. Senate, became the first woman elected to a second term in office.