| Election Name: | 1820 Maine gubernatorial election |
| Country: | Maine |
| Type: | gubernatorial |
| Ongoing: | no |
| Next Election: | 1821 Maine gubernatorial election |
| Next Year: | 1821 |
| Election Date: | April 3, 1820 |
| Image1: | Governor William King in 1806.png |
| Candidate1: | William King |
| Party1: | Democratic-Republican Party |
| Popular Vote1: | 21,083 |
| Percentage1: | 95.3% |
| Map Size: | 200px |
| Governor | |
| Before Election: | John Brooks (Massachusetts) as Governor of Massachusetts |
| Before Party: | Federalist Party |
| After Election: | William King |
| After Party: | Democratic-Republican Party |
The 1820 Maine gubernatorial election took place on April 3, 1820. It was the first election for Governor of Maine, taking place after Maine separated from Massachusetts and was recognized as a state on March 15, 1820. Maine's separation from Massachusetts came as a result of The Missouri Compromise. This election saw the virtually unanimous election of William King, the man most chiefly responsible for the push for Maine statehood. He had no opponents.