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Scientific models occupy centre stage in scientific practice. Correspondingly, in recent literature in the philosophy of science, scientific models have been a focus of research. However, little attention has been paid so far to the ontology of scientific models. In this essay, I attempt to clarify the issues involved in formulating an informatively rich ontology of scientific models. Although no full-blown theorycontaining all ontological issues involved-is provided, I make several distinctions and point to several characteristic properties exhibited by scientific models that are relevant for individuating scientific models.