Donald J. DeFronzo is an American politician. He was a Democratic state senator from Connecticut from 2003 until 2011 when he was appointed Department of Administrative Services commissioner by Governor Dan Malloy. A resident of New Britain, DeFronzo represented Berlin, Farmington, and New Britain in the Connecticut Senate. Prior to being elected to the Senate, he served as mayor of New Britain from 1989 to 1993. On August 24, 2017, Governor Dan Malloy named DeFronzo chair of the .