Adorno's lectures on ontology and dialectics from 1960-61 comprise his most sustained and systematic analysis of Heidegger's philosophy. They also represent a continuation of a project that Adorno shared with Walter Benjamin - 'to annihilate Heidegger'. Following the publication of Heidegger's magnum opus, Being and Time, and long before his notorious endorsement of Nazism at Freiburg University, both Adorno and Benjamin had already rejected Heidegger's fundamental ontology. After his return to Germany from his exile in the US, Adorno became Heidegger's intellectual counterpart, engaging more intensively with his work than with that of any other contemporary philosopher. Adorno regarded Heidegger as an extremely limited thinker, and for that reason all the more dangerous. In these lectures, he highlights Heidegger's increasing fixation with the concept of ontology to show that the doctrine of being can only truly be understood through a process of dialectical thinking. Rather than through overt political denunciation, Adorno deftly highlights the connections between Heidegger's philosophy and his political views, and in doing so offers an alternative plea for enlightenment and rationality. These seminal lectures in which Adorno dissects the thought of the one of the most influential philosophers of the 20th century will appeal to students and scholars in philosophy and critical theory and throughout the humanities and social sciences.