This is an introduction to Wittgenstein’s Philosophical Investigations. We will read §§1-184, which is about one third of the book. Wittgenstein lived from1889 until 1951, and the Philosophical Investigations appeared in 1953. We can distinguish three periods in his development, an early period, a middle period of transition, and a late period. This book is the main result of his late period. It contains the thoughts Wittgenstein was struggling with from 1929 until 1949. It is a classic in analytic philosophy of language. We will use the translation by Anscombe. It is available as bilingual edition. Knowledge of German is not required, but it will be helpful.