William Floyd Weld (born July 31, 1945) is an American attorney, businessman, and Republican politician who served as the 68th Governor of Massachusetts from 1991 to 1997 and the Libertarian Party's nominee for Vice President of the United States in the 2016 election, sharing the ticket with Gary Johnson. He is formally running to seek the Republican nomination for President of the United States in 2020.

A Harvard and Oxford graduate, Weld began his career as legal counsel to the United States House Committee on the Judiciary before becoming the United States Attorney for the District of Massachusetts and, later, the United States Assistant Attorney General for the Criminal Division. He focused on a series of high-profile public corruption cases. He resigned in protest of an ethics scandal and associated investigations of Attorney General Edwin Meese. [source]