| Election Name: | 1926 United States Senate election in Illinois |
| Country: | Illinois |
| Flag Year: | 1915 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1920 United States Senate election in Illinois |
| Previous Year: | 1920 |
| Next Election: | 1928 United States Senate special election in Illinois |
| Next Year: | 1928 (special) |
| Election Date: | November 2, 1926 |
| Image1: | Frank L. Smith (1).jpg |
| Nominee1: | Frank L. Smith |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 842,273 |
| Percentage1: | 46.86% |
| Nominee2: | George E. Brennan |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 774,943 |
| Percentage2: | 43.12% |
| Image3: | Hugh S. McGill.png |
| Nominee3: | Hugh S. McGill |
| Party3: | Independent (politician) |
| Popular Vote3: | 156,245 |
| Percentage3: | 8.69% |
| Map Size: | 300px |
| U.S. senator | |
| Before Election: | William B. McKinley |
| Before Party: | Republican Party (United States) |
| After Election: | Frank L. Smith[1] |
| After Party: | Republican Party (United States) |
The 1926 United States Senate election in Illinois took place on November 2, 1926.[2]
Incumbent first-term Republican senator William B. McKinley, lost renomination in the Republican primary.
The U.S. Senate ultimately refused to seat the election's winner, Republican Frank L. Smith, due to allegations of election fraud.[3] [4] [5]
The primaries and general election coincided with those for House and those for state elections.[2] Primaries were held April 13, 1926.[2]