| Election Name: | 1990 Maine gubernatorial election |
| Country: | Maine |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1986 Maine gubernatorial election |
| Previous Year: | 1986 |
| Next Election: | 1994 Maine gubernatorial election |
| Next Year: | 1994 |
| Election Date: | November 6, 1990 |
| Image1: | Image:Governor John McKernan official portrait (cropped).jpg |
| Nominee1: | John McKernan |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 243,766 |
| Percentage1: | 46.7% |
| Nominee2: | Joseph Brennan |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 230,038 |
| Percentage2: | 44.1% |
| Nominee3: | Andrew Adam |
| Party3: | Independent (United States) |
| Popular Vote3: | 48,377 |
| Percentage3: | 9.3% |
| Map Size: | 300px |
| Governor | |
| Before Election: | John McKernan |
| Before Party: | Republican Party (United States) |
| After Election: | John McKernan |
| After Party: | Republican Party (United States) |
The 1990 Maine gubernatorial election took place on November 6, 1990 to elect the governor of Maine. Incumbent Republican governor John McKernan won re-election to a second term, defeating Democratic nominee, former governor Joseph E. Brennan in a tight contest. Independent Andrew Adam took in 9.3% of the vote. This was the last election until 2010 that Maine elected a Republican governor. This was also the last Maine gubernatorial election until 2022 in which the winner was of the same party as the incumbent president. This is also the last Maine gubernatorial election that an incumbent governor won with a smaller margin of victory in that person's re-election bid.