In this session, attendees will learn about the various types of persistent identifiers for objects, and the range of use cases for these PIDs. Digital Object Identifiers (DOIs) are the best-known object identifiers, and are most often used for publications and datasets; however, they can also be used for a range of other objects created as part of the research process. Beyond the DOI, identifiers exist for research activity, repositories, physical samples, equipment, and more. This session will explore the evolving object identifier landscape and discuss strategies for incorporating object PIDs into a national implementation plan.