David G. Deininger (b. July 9, 1947) is an American Republican politician and jurist from Wisconsin.
Born in Monroe, Wisconsin, Deininger graduated from the United States Naval Academy in 1969. He served in the United States Navy on a submarine until 1975. In 1978, he graduated from the University of Wisconsin Law School and then practiced law. From 1987 until 1994, Deininger served in the Wisconsin State Assembly. He then served as a Wisconsin Circuit Court judge for Green County, Wisconsin 1994-1996, when he was appointed to the Wisconsin Court of Appeals serving until his retirement in 2007.[1][2]