Robert J. Auth (born July 4, 1956) is an American Republican Party politician from New Jersey who represents the 39th Legislative District in the New Jersey General Assembly.
Auth received his B.A. from New York University with majors in History and Philosophy. He serves in the Assembly on the Financial Institutions and Insurance Committee, Commerce and Economic Development Committee and the Education Committee. He is also the Chief Executive Officer at Plaza Travel and Insurance Services Ltd., a company he founded in 1985. In the past, he served as an aide to Senator Gerald Cardinale on insurance and economic matters and was a teacher for the North Bergen School District from 2004 to 2006. Auth also previously worked as an agency manager at the North Bergen Motor Vehicle Commission office. He is an aircraft pilot having flown since 1982. He and his wife Elsa have one grown son.
Auth is a resident of Old Tappan, where he is the Republican Party municipal chairman. Replacing Bob Schroeder who did not run for re-election, Auth won in the 2013 general election together with the rest of the Republican slate in the legislative district that included Gerald Cardinale in the New Jersey Senate and Assembly running mate Holly Schepisi. In the Assembly, he currently serves on the Financial Institutions and Insurance Committee, Commerce and Economic Development Committee, and the Education Committee.