| Election Name: | 1926 United States Senate election in Oklahoma |
| Country: | Oklahoma |
| Flag Year: | 1925 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1920 United States Senate election in Oklahoma |
| Previous Year: | 1920 |
| Next Election: | 1932 United States Senate election in Oklahoma |
| Next Year: | 1932 |
| Election Date: | November 2, 1926 |
| Image1: | File:Rep. Elmer Thomas of Okl. LCCN2016841959 (cropped).jpg |
| Nominee1: | Elmer Thomas |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 195,312 |
| Percentage1: | 54.78% |
| Nominee2: | John W. Harreld |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 159,287 |
| Percentage2: | 44.67% |
| Map Size: | 200px |
| U.S. Senator | |
| Before Election: | John W. Harreld |
| Before Party: | Republican Party (United States) |
| After Election: | Elmer Thomas |
| After Party: | Democratic Party (United States) |
The 1926 United States Senate election in Oklahoma took place on November 2, 1926. Incumbent Republican Senator John W. Harreld ran for re-election to a second term. After facing many challengers in a crowded Republican primary, he advanced to the general election. In the Democratic primary, Congressman Elmer Thomas beat out a similarly crowded field, which included former Governor Jack C. Walton, to win his party's nomination with a plurality. In the general election, Thomas defeated Herrald in a landslide, winning his first of four terms in the U.S. Senate.