| Election Name: | 2004 United States Senate election in New Hampshire |
| Country: | New Hampshire |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1998 United States Senate election in New Hampshire |
| Previous Year: | 1998 |
| Next Election: | 2010 United States Senate election in New Hampshire |
| Next Year: | 2010 |
| Election Date: | November 2, 2004 |
| Image1: | Judd Gregg.jpg |
| Nominee1: | Judd Gregg |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 434,847 |
| Percentage1: | 66.24% |
| Nominee2: | Doris Haddock |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 221,549 |
| Percentage2: | 33.75% |
| U.S. Senator | |
| Before Election: | Judd Gregg |
| Before Party: | Republican Party (United States) |
| After Election: | Judd Gregg |
| After Party: | Republican Party (United States) |
The 2004 United States Senate election in New Hampshire was held November 2, 2004. Incumbent Republican U.S. Senator Judd Gregg won re-election to a third term. As of 2024, this is the last time that a man won a United States Senate election in New Hampshire.