James J. Christiana III (born October 3, 1983) is an American politician. He served as a Republican member of the Pennsylvania House of Representatives from 2009 to 2019. The great-grandson of Italian immigrants, Christiana is a fourth-generation resident of Beaver County, Pennsylvania and a member of the First Presbyterian Church in Beaver, Pennsylvania. He graduated from Beaver High School in Beaver, Pennsylvania in 2002. In November 2008, he defeated Democratic incumbent Vince Biancucci to represent the 15th legislative district in the Pennsylvania House of Representatives.