Antonio Maria Zanetti (the younger), also Anton Maria Zanetti, (1706–1778) was a Venetian art historian, noted for his knowledge of antiquities, numismatics, statues, cameos, and sculpted gems. He was skilled in architecture and perspective and was an expert in music. As custodian of the Marciana Library (1737–1778), he compiled the first modern catalogues of the manuscript collection with detailed bibliographical information.