The 2020 New Hampshire Republican presidential primary took place on Tuesday, February 11, 2020, as the second nominating contest in the Republican Party presidential primaries for the 2020 presidential election, following the Iowa caucuses the week before. The New Hampshire primary is a semi-closed primary, meaning that only Republicans and independents may vote in this primary.

Presidential primaries and caucuses of the Republican Party took place in many U.S. states, the District of Columbia, and five U.S. territories from February 3 to August 11, 2020, to elect most of the 2,550 delegates to send to the Republican National Convention. Delegates to the national convention in other states were elected by the respective state party organizations. The delegates to the national convention voted on the first ballot to select Donald Trump as the Republican Party's nominee for president of the United States in the 2020 election, and selected Mike Pence as the vice-presidential nominee.