Same-sex marriage in New Hampshire

Same-sex marriage has been legal in New Hampshire since January 1, 2010, based on legislation signed into law by Governor John Lynch on June 3, 2009. The law provided that civil unions, which the state had established on January 1, 2008, would be converted to marriages on January 1, 2011, unless dissolved, annulled, or converted to marriage before that date.

New Hampshire was the fourth state in New England and the fifth, excluding California which had constitutionally banned same-sex marriage, but still recognized prior marriages, in the country, after Massachusetts, Connecticut, Iowa and Vermont, to legalize same-sex marriage.