Roy J. McDonald (born April 12, 1947) is a Republican politician and former member of the New York State Legislature who represented the 43rd District in the New York State Senate and Districts 100 and 112 in the New York State Assembly. McDonald served as Town and County Supervisor for the Town of Wilton, New York for 23 years. Following his tenure as Supervisor, McDonald served in the Assembly from 2002 to 2008 and served in the Senate from 2009 to 2012.