This book develops a new Wittgenstein interpretation called Wittgenstein's Metametaphysics. The basic idea is that one major strand in Wittgenstein's early and later philosophy can be described as undermining the dichotomy between realism and idealism. The aim of this book is to contribute to a better understanding of the relation between language and reality and to open up avenues of dialogue to overcome deep divides in the research literature. In the course of developing a comprehensive and in-depth interpretation, the author provides fresh and original analyses of the latest issues in Wittgenstein scholarship and gives new answers to both major exegetical and philosophical problems. This makes the book an illuminating study for scholars and advanced students alike.