Libertarian Party of New Hampshire is the New Hampshire affiliate of the Libertarian Party of the United States. The party's current Chair is Darryl W. Perry. On July 16, 1991 Calvin Warburton became the first sitting legislator to switch parties to the Libertarian Party, and the first Libertarian legislator in the contiguous 48 states. Warburton was serving his seventh term as a Republican state representative in New Hampshire when, at age 81, he switched to the Libertarian Party. In 1992, four Libertarians were elected to the New Hampshire House of Representatives. Warburton (who was re-elected to an eighth term), Andy Borsa, Don Gorman, and Finlay Rothhaus were all elected as state representatives. The four formed an officially recognized Libertarian Caucus with Gorman as the LibertarianFloor Leader. From 1973 to 1976, Gorman had served in the legislature as a Republican. In 1994, Don Gorman was re-elected to the New Hampshire House of Representatives along with Jim McClarin.
State Representative Caleb Q. Dyer changed party affiliation to the Libertarian Party from the Republican Party on February 9, 2017.