The question of what constitutes a human being, being human, humanness or humanity, in all its variations, has been a longstanding feature in academic and public discourse, and particularly in its relation with human rights. The varied answers and perspectives can influence attitudes and social behaviour that are either in line with or in opposition to human rights norms. The lecture will consider the various perspectives from philosophical, biological, theological, sociological and legal sources, and how these categorizations intersect with human rights objectives.