Since their introduction in the early 1970’s, carbon fibre reinforced carbon (CC) composites have become a well-established form of engineering carbon and find widespread application in both aerospace and materials processing industries. In fact, CC composites are notable as being among the most successful of the “brittle matrix composite” engineering materials. Their success largely arises from the ability to translate the lattice properties of the graphite crystal into a bulk material. The purpose of this chapter is to provide an overview of the many ways in which processing may be used to change the structure of CC composites and to thereby describe how processing can be used to control composite properties.