| Election Name: | 1936 United States Senate election in Iowa |
| Country: | Iowa |
| Flag Image: | Flag of Iowa (xrmap collection).svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1930 United States Senate election in Iowa |
| Previous Year: | 1930 |
| Next Election: | 1942 United States Senate election in Iowa |
| Next Year: | 1942 |
| Election Date: | November 3, 1936 |
| Nominee1: | Clyde Herring |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 539,554 |
| Percentage1: | 50.26% |
| Nominee2: | L. J. Dickinson |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 504,535 |
| Percentage2: | 47.34% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Lester J. Dickinson |
| Before Party: | Republican Party (United States) |
| After Election: | Clyde Herring |
| After Party: | Democratic Party (United States) |
The 1936 United States Senate election in Iowa took place on November 3, 1936. Incumbent Republican Senator Lester J. Dickinson ran for re-election to a second term but was defeated by Democratic Governor Clyde Herring. This was the first time since 1855 that Democrats held both of the state's senate seats.