This document is a dissertation submitted by a student for their BA degree in philosophy. The 8,194 word document contains an abstract, introduction, three chapters, and a conclusion examining whether the later philosophy of Wittgenstein can be considered a form of transcendental idealism. Chapter 1 defines transcendental idealism according to Kant and contrasts it with realism and idealism. It also discusses an interpretation of Wittgenstein's early philosophy as a form of transcendental solipsism. Chapter 2 evaluates Bernard Williams' argument that Wittgenstein's later philosophy retains elements of transcendental idealism. Chapter 3 examines the nature of Wittgenstein's later philosophy in the Philosophical Investigations. The conclusion argues that