The 2016 presidential campaign of Gary Johnson, the 29th Governor of New Mexico, was announced on January 6, 2016, for the nomination of the Libertarian Party for President of the United States. He officially won the nomination on May 29, 2016, at the Libertarian National Convention in Orlando, Florida, receiving 56% of the vote on the second ballot. Former Massachusetts Governor William Weld was endorsed by Johnson for the Libertarian vice-presidential nomination, which he also received on May 29, 2016.

Gary Earl Johnson is an American businessman and politician who served as the 29th governor of New Mexico from 1995 to 2003 as a member of the Republican Party. He has been a member of the Libertarian Party since 2011 and was the party's nominee for President of the United States in the 2012 and 2016 elections. He was also the Libertarian nominee in the 2018 U.S. Senate election in New Mexico.