| Election Name: | 2002 United States Senate election in Iowa |
| Country: | Iowa |
| Flag Image: | Flag of Iowa (xrmap collection).svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1996 United States Senate election in Iowa |
| Previous Year: | 1996 |
| Next Election: | 2008 United States Senate election in Iowa |
| Next Year: | 2008 |
| Election Date: | November 5, 2002 |
| Image1: | File:Tom Harkin official portrait (cropped).jpg |
| Nominee1: | Tom Harkin |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 554,278 |
| Percentage1: | 54.18% |
| Nominee2: | Greg Ganske |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 447,892 |
| Percentage2: | 43.78% |
| Map Size: | 240px |
| U.S. Senator | |
| Before Election: | Tom Harkin |
| Before Party: | Democratic Party (United States) |
| After Election: | Tom Harkin |
| After Party: | Democratic Party (United States) |
The 2002 United States Senate election in Iowa was held on November 5, 2002. Incumbent Democratic U.S. Senator Tom Harkin sought re-election to a fourth term in office. Harkin was opposed in the general election by U.S. Congressman Greg Ganske, who fought off a difficult challenger in the Republican primary. Though Harkin narrowly defeated his opponent six years earlier, he was able to defeat Ganske by a comfortable margin to win re-election.