| Election Name: | 1978 New Hampshire gubernatorial election |
| Country: | New Hampshire |
| Type: | presidential |
| Ongoing: | Yes |
| Previous Election: | 1976 New Hampshire gubernatorial election |
| Previous Year: | 1976 |
| Next Election: | 1980 New Hampshire gubernatorial election |
| Next Year: | 1980 |
| Election Date: | November 6, 1978 |
| Image1: | File:Gov Hugh Gallen (cropped).jpg |
| Nominee1: | Hugh Gallen |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 133,133 |
| Percentage1: | 49.38% |
| Nominee2: | Meldrim Thomson Jr. |
| Party2: | Republican Party (US) |
| Popular Vote2: | 122,464 |
| Percentage2: | 45.43% |
| Governor | |
| Map Size: | 240px |
| Before Election: | Meldrim Thomson Jr. |
| Before Party: | Republican Party (United States) |
| After Election: | Hugh Gallen |
| After Party: | Democratic Party (United States) |
The 1978 New Hampshire gubernatorial election took place on November 6, 1978.
Incumbent Republican Governor Meldrim Thomson Jr., who defeated former governor Wesley Powell for the Republican nomination, ran for a fourth term in office, but was defeated by State Representative Hugh Gallen.