Same-sex marriage in Maine

Same-sex marriage has been legally recognized in Maine since December 29, 2012. A bill for the legalization of same-sex marriages was approved by voters, 53–47 percent, on November 6, 2012, as Maine, Maryland and Washington became the first U.S. states to legalize same-sex marriage by popular vote. Election results were certified by the Maine Secretary of State's office and the Governor of Maine, Paul LePage, on November 29. Maine was the eighth U.S. state to legalize same-sex marriage.

The 2012 referendum was a reversal of action on a similar bill three years earlier. On May 6, 2009, a bill to allow same-sex marriage in Maine was signed into law by Governor John Baldacci following legislative approval. Opponents of the bill successfully petitioned for a referendum before the law went into effect; voters rejected the law on November 3, 2009, in a "people's veto". Until the referendum result rejected the law, it appeared that Maine would be the first U.S. state to legalize same-sex marriage through the legislative process with a governor's signature, rather than following a judicial ruling. Vermont was the first state to legalize same-sex marriage by statute, but its legislature did so by overriding its governor's veto.