In this book, the modes of Marxist alienation, namely the alienation from Self, society, species-being, products and labour are analyzed in the conceptual context of Being and Time. This work expresses that Heideggerian philosophy is not at odds with Marxism on contrary to Adorno’s arguments in The Jargon of Authenticity. Heidegger’s ontologico-existential philosophy could be effective in the analysis of the problem with regard to socio-psychological causes and effects of alienation on which the method of political economy may remain inadequate. In particular, Dasein’s free and authentic self-understanding which gets rid of the suppressive authority of publicness, the unifying idea of the ontological Being-with Others and the phenomenological insight into the nature can introduce a revolutionary perspective into the problems of alienation and mass cultures. In this context, the similarities in the approaches of Marx and Heidegger are discussed in detail. This analysis tries to form a new correlation between Heideggerian and Marxist philosophies and could make use for academics, any researchers on the concept of alieneation as well as the faithful readers Marx, Adorno and Heidegger.