William Rufus DeVane King (April 7, 1786 – April 18, 1853) was an American politician and diplomat. He was the 13th vice president of the United States from March 4 until his death in April 1853. Earlier he had served as a U.S. representative from North Carolina and a senator from Alabama. He also served as minister to France under President James K. Polk.

A Democrat, he was a Unionist and his contemporaries considered him to be a moderate on the issues of sectionalism, slavery, and westward expansion, which contributed to the American Civil War. He helped draft the Compromise of 1850. He is the only United States vice president to take the oath of office on foreign soil; he was inaugurated in Cuba, due to his poor health. He died of tuberculosis 45 days later, becoming the third vice president to die in office. Only John Tyler and Andrew Johnson, both of whom succeeded to the presidency, have had shorter tenures. King was the only U.S. vice president from Alabama.