Written by an international team of Marx scholars, this book offers comprehensive coverage of Marx's life and contexts, sources, influences and encounters, key writings, major themes and topics, and reception and influence. The Companion considers new directions in Marxism that animate theoretical, scientific, and political aspects of Marx's ideas. Gender and Marxist-feminism is a new topic and is examined alongside traditional categories of critique, such as class, capital, and mode of production. The Companion showcases the methodological and political importance of Marxism in environmentalist politics. Finally, a review of non-European Marxisms demonstrates the pivotal role of Marxist thought in political movements both within and beyond the Global North.