James A. Murphy III (born c. 1961) is an American politician, a former district attorney, and a jurist. He is currently an Acting Justice of the Supreme Court of the State of New York and the county court judge for Saratoga County, New York. Murphy began serving in the Saratoga County District Attorney's Office in 1988, as an assistant DA. He first was elected district attorney in 1997 and was sworn in on January 2, 1998. He was re-elected in 2001, 2005, 2009 and 2013. In all, he served for nearly 30 years as a prosecutor. His grandfather was United States Congressman Carleton J. King.