| Election Name: | 1974 United States Senate election in Iowa |
| Country: | Iowa |
| Flag Image: | Flag of Iowa (xrmap collection).svg |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1968 United States Senate election in Iowa |
| Previous Year: | 1968 |
| Next Election: | 1980 United States Senate election in Iowa |
| Next Year: | 1980 |
| Election Date: | November 5, 1974 |
| Image1: | File:John C. Culver.jpg |
| Nominee1: | John Culver |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 426,947 |
| Percentage1: | 50.02% |
| Nominee2: | David M. Stanley |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 420,546 |
| Percentage2: | 49.27% |
| Map Size: | 240px |
| U.S. Senator | |
| Before Election: | Harold E. Hughes |
| Before Party: | Democratic Party (United States) |
| After Election: | John C. Culver |
| After Party: | Democratic Party (United States) |
The 1974 United States Senate election in Iowa took place on November 5, 1974. Incumbent Democratic U.S. Senator Harold E. Hughes retired. The open seat was won by U.S. Representative John C. Culver, defeating Republican State Representative David M. Stanley., this was the most recent election in which a Democrat, or anyone other than Chuck Grassley, has won the Class 3 Senate seat in Iowa.