Jack M. Ciattarelli (/tʃɪtəˈrɛli/ chi-tə-RELL-ee; born December 12, 1961) is an American politician and businessman. A member of the Republican Party, he served in the New Jersey General Assembly from 2011 to 2018, representing the 16th legislative district. He was also the Republican nominee in the 2021 New Jersey gubernatorial election, which he narrowly lost to incumbent Democratic Governor Phil Murphy.