Joseph Adam Miller III (born June 28, 1969) is an American educator and politician currently serving as the State Representative for the 53rd district of the Ohio House of Representatives. He is a member of the Democratic Party. His district consists of parts of northern Lorain County. He is a former City Council Member for the city of Amherst, Ohio.
Miller was elected in the general election on November 6, 2018, winning 63 percent of the vote over 37 percent of Republican candidate Rob Weber. He would be reelected three more times, and is now term limited in the Ohio House of Representatives. Miller is currently a candidate for Ohio's 13th senatorial district in the upcoming 2026 Ohio Senate election.
Miller is a member of the following committees in the 136th GA: Workforce and Higher Education, Education, Public Pensions and Insurance, and he is the ranking member on Agriculture.