This chapter examines Francisco Suárez's view of transcendentals and categories as explored in his most significant work, Metaphysical Disputations. Even a glance into the contents of this work reveals that both transcendentals and categories lie at the center of Suárez's metaphysics. The chapter considers transcendentals, asking what they are and about their identity, number, and order. It then takes up categories, what they are and their identity, number, and relations. Like his scholastic predecessors, Suárez holds that categories are primarily diverse, which means that they share no property or genus. The aim of science from an Aristotelian-scholastic perspective is the possession of certain knowledge of truth, acquired by demonstration. For Suárez, metaphysics is the science of the transcendentals, which was a view first proposed by Scotus. In this Suárez's metaphysics manifests a fundamentally Scotistic character in spite of many real and apparent disagreements with Scotus on particular issues.