This thesis enquires into the question of the hidden nature of things and reality in the context of David Hume's philosophy. In the context of a Humean approach to reality, it discusses whether the things which we perceive and which are considered to be perceptions can have some sort of non-empirical correlation that lies beneath them and whether it can be called the hidden nature of these things. The first half of the thesis is focused on the philosophy of David Hume. In the second half of the thesis two original considerations about the hidden nature and its characteristics are presented. The thesis starts with three selected theories of substance as presented in A Treatise of Human Nature. The theory of John Locke and the theory of the peripatetics are presented from Hume's critical perspective. Consequently is presented an interpretation called the New Hume. In the context of this interpretation, Hume presumes that there are hidden entities lying beneath empirical reality. Then, there are two considerations focused on the hidden nature of things and its characteristics which are presented. These characteristics are consequently being described in an indirect manner. And finally an original suggestion of how to understand the hidden nature is presented. It has the character of mere...