| Election Name: | 1968 United States Senate election in New Hampshire |
| Country: | New Hampshire |
| Flag Year: | 1931 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1962 United States Senate election in New Hampshire |
| Previous Year: | 1962 |
| Next Election: | 1974–75 United States Senate elections in New Hampshire |
| Next Year: | 1974 |
| Election Date: | November 5, 1968 |
| Image1: | File:Norris Cotton.jpg |
| Nominee1: | Norris Cotton |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 170,163 |
| Percentage1: | 59.29% |
| Nominee2: | John W. King |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 116,816 |
| Percentage2: | 40.70% |
| Map Size: | 245px |
| U.S. Senator | |
| Before Election: | Norris Cotton |
| Before Party: | Republican Party (United States) |
| After Election: | Norris Cotton |
| After Party: | Republican Party (United States) |
The 1968 United States Senate election in New Hampshire took place on November 5, 1968. Incumbent Republican Senator Norris Cotton won re-election to a third full term.
Primary elections were held on September 10, 1968.