 This entry concerns a variety of problems that arise in connection with ordinary material objects. Proposed solutions to the problems, as we shall see, almost invariably have one of three unpalatable consequences. First, overpopulating the world with things that seem not to be there, be it too many tables, or too many things in one place, or too many causes of the same events, or a plenitude of objects with extraordinary mereological or modal profiles. Second, unpalatable arbitrariness, be it arbitrariness concerning which kinds of objects there are, which objects do and don’t belong to a given kind, which modal profiles are instantiated by which objects, or which objects together compose a further object. Third, unpalatable indeterminacies, be it indeterminate truth values, indeterminate identities, ontic indeterminacy, or existential indeterminacy. For this reason, some view the problems as constituting a powerful case for the elimination of the ordinary objects that give rise to them in the first place.