John H. "Jack" Flood (June 24, 1939 – July 26, 2016) was an American politician who was Sheriff of Norfolk County, Massachusetts from 1996 to 1999 and a member of the Massachusetts House of Representatives from 1981 to 1991. In 1990, Flood was a candidate for Governor of Massachusetts. His campaign came to an end at the Democratic Convention when he failed to get the 15% necessary to appear on the primary ballot. During the general election, Flood frequently criticized Democratic nominee John Silber, who went on to lose to Republican William Weld. Weld later named Flood to his transition team.