The 1914 United States Senate elections in Arizona took place on November 3, 1914. Incumbent Democratic U.S. Senator Marcus A. Smith ran for reelection to a second term, defeating Republican State Senator Don Lorenzo Hubbell in the general election by a wide margin. Several third party candidates also ran in the election, notably former Prohibition Party Presidential nominee Eugene W. Chafin, as well as Bert Davis of the Socialist Party and J. Bernard Nelson of the Progressive Party.