Jack A. Brown (May 2, 1929 – October 28, 2015) was an American rancher and politician. Born in St. Johns, Arizona, Brown received his bachelor's degree in agriculture and economics from Brigham Young University. Brown participated in the real estate business. Brown served in the Arizona House of Representatives from 1963–1974, 1987–1996 and from 2004–2010. He also served in the Arizona State Senate from 1999 to 2004 and was a Democrat.