| Election Name: | 1942 United States Senate election in New Hampshire |
| Country: | New Hampshire |
| Flag Year: | 1931 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1936 United States Senate election in New Hampshire |
| Previous Year: | 1936 |
| Next Election: | 1948 United States Senate election in New Hampshire |
| Next Year: | 1948 |
| Election Date: | November 3, 1942 |
| Image1: | File:Styles Bridges (1939).jpg |
| Nominee1: | Styles Bridges |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 88,601 |
| Percentage1: | 54.60% |
| Nominee2: | Francis P. Murphy |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 73,656 |
| Percentage2: | 45.40% |
| Map Size: | 245px |
| U.S. Senator | |
| Before Election: | Styles Bridges |
| Before Party: | Republican Party (United States) |
| After Election: | Styles Bridges |
| After Party: | Republican Party (United States) |
The 1942 United States Senate election in New Hampshire took place on November 3, 1942. Incumbent Republican Senator Styles Bridges won re-election to a second term in office, defeating Democratic former Governor Francis P. Murphy.
Primary elections were held on September 15, 1942.