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Any interference with a person's right to the enjoyment of his chattels (trespass to land is considered to be a separate tort, with different rules). Some authors consider conversion to be a form of trespass to goods, but these torts are historically distinct. See interference with goods for an overview of the differences.

To succeed in a claim for trespass to goods, the claimant need not show that he has suffered any damage, although usually he will have. He will have to show that the trespass resulted from the direct action of the defendant; if the action is indirect the claimant will probably have to rely on negligence instead (there is some uncertainty about this).