John Hayden Lynch is an American attorney, businessman, and politician who served as the 80th governor of New Hampshire from 2005 to 2013. Lynch was first elected governor in 2004, defeating first-term Republican incumbent Craig Benson – the first time a first-term incumbent New Hampshire governor was defeated for re-election in 80 years. Lynch won re-election in landslide victories in 2006 and 2008, and comfortably won a fourth term in 2010.

The governor of New Hampshire is the head of government of the U.S. state of New Hampshire.