Alexandre Matheron has worked and written substantially on Spinoza since the publication of his influential 1969 masterpiece 'Individu et communaut chez Spinoza' (ditions de Minuit) and he is considered one of the most important interpreters of Spinoza's philosophy in the 20th century. The 20 essays gathered here focus on the themes of ontology, knowledge, politics and ethics in Spinoza, his predecessors and his contemporaries. This is a crucial collection for anyone seeking to understand 20th-century continental Spinozism.