Some interpreters argue that the Wittgenstein of the Philosophical Investigations is an idealistic philosopher. This chapter establishes this characterization applied to the Tractatus as well. While Wittgenstein often refers there to the “world”, he means only what our language and thinking refer to. The intelligible, for Wittgenstein, is strictly limited to the “world” as what features logical order (form), about which we can speak. The chapter substantiates, further, that Wittgenstein’s idealism is not a Kantian transcendental idealism, exhibiting instead affinities with the classical idealisms identified with the likes of Aristotle, Spinoza and Hegel.