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There has been contemporary disagreement about Aristotle`s substance theory. This disagreement has mainly focused on the problem of whether Aristotelian forms are particular or universal. According to the majority of the criteria which are stipulated by Aristotle in Metaphysics Zeta, forms are substances. However, Aristotle also explicitly outlines in the Zeta, and especially in chapters 13 and 16, that no universal can be a substance. At these points in his work, Aristotle should have been clearer regarding whether forms are universals or particulars. In terms of the conclusion of Chapter 13 of Zeta, as well as some other criteria, one may conclude that, if the substance is form, then it should be particular. There are many instances, however, where Aristotle says that since universals are knowable, particulars cannot be known. It seems that if substances are particulars, it is hard to see how they can be knowable. Furthermore, if they are universal, it is hard to say whether particular forms are substances. Since Aristotle never mentioned whether forms could be both universal and particular, this causes difficulties. To examine this problem in more depth, I will not only analyse some textual evidence which is often used to justify the view that forms are universal, but also some textual evidence which is used to justify the view that forms are particular. In so doing, I will also identify some possible solutions regarding the problem of the status of forms in Aristotle`s substance theory. Lastly, I will suggest that individual forms are substances because they are instances of universals and, hence, may be knowable. I will support my view by employing the neo-Aristotelian substance theory posited by Jonathan Lowe; namely, the “Four-Category Ontology.” .