| Election Name: | 1986 Maine gubernatorial election |
| Country: | Maine |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1982 Maine gubernatorial election |
| Previous Year: | 1982 |
| Next Election: | 1990 Maine gubernatorial election |
| Next Year: | 1990 |
| Election Date: | November 4, 1986 |
| Image1: | File:Governor John McKernan official portrait (cropped).jpg |
| Nominee1: | John McKernan |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 170,312 |
| Percentage1: | 39.9% |
| Nominee2: | James Tierney |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 128,744 |
| Percentage2: | 30.2% |
| Nominee4: | Sherry Huber |
| Party4: | Independent (United States) |
| Popular Vote4: | 64,317 |
| Percentage4: | 15.1% |
| Nominee5: | John Menario |
| Party5: | Independent (United States) |
| Popular Vote5: | 63,474 |
| Percentage5: | 14.9% |
| Map Size: | 300px |
| Governor | |
| Before Election: | Joseph Brennan |
| Before Party: | Democratic Party (United States) |
| After Election: | John McKernan |
| After Party: | Republican Party (United States) |
The 1986 Maine gubernatorial election took place on November 4, 1986. Incumbent Democratic Governor Joseph Brennan was term limited and ineligible to seek re-election. First district Congressman John McKernan defeated Democratic Party challenger James Tierney as well as former Republican turned Independent Sherry Huber and former Portland, Maine, city manager John Menario, making McKernan the first Republican to win The Blaine House since 1962. William Diamond unsuccessfully ran for the Democratic nomination.
The three main issues during the campaign were: the future of the Maine Yankee Nuclear Power Plant in Wiscasset, economic development and McKernan's congressional record.[1]
The future of the Power Plant had been placed up for statewide referendum in 1980 and again in 1982. McKernan and Menario opposed the closure of Maine Yankee, while Tierney and Huber supported the efforts to close the Plant in 1988.[1]