This book aims to analyse the concept of altruism starting from classical philosophy up to the systems of ideas of contemporaneity, considering the approaches and authors of reference in an interdisciplinary and transdisciplinary way. The representations of altruism and egoism in contemporary society are constantly changing, following the transformations of society itself. Having abandoned the idea that the factors leading to altruism or egoism lay only in human nature, we find them in people’s conduct, freedom, relationships, their associative forms and society. The attention is thus turned to two elements of the daily life of individuals: culture and social relations. The book tries, therefore, through the meso-theories developed in recent decades, which study the relationships between life-world and social system, to describe the links between altruism, egoism, culture and social relations. We will pay particular attention to the relationality of individuals, in an attempt to overcome the dichotomy altruism/egoism by reading some aspects little considered by previous studies - or contemplated only indirectly or marginally. The ultimate goal is to highlight how positive actions are necessary for the contemporary society and how social sciences must go back and study positive socio-cultural actions and phenomena, not only negative, as a way to promote them for the well-being of the society.