Donald P. Wagner (born December 3, 1960) is an American politician, currently serving as a member of the Orange County Board of Supervisors for the 3rd district and vice chair. He previously served as mayor of Irvine, California and as a Republican member of the California State Assembly, representing the 68th district, which includes portions of Orange County. In 2019, Wagner won a seat as a nonpartisan representative on the Orange County Board of Supervisors, representing District 3.