Reflexivity grew particularly significant in late modernity, as a characteristic of culture on the one hand, and a factor important for the man’s development, on the other. The aim of this work is to analyze the idea of reflexivity as one of central categories which describe changes in late modernity, and, next, to outline its function in the process of adults’ self-creation. Reflexivity is a relatively new idea, embracing two primary dimensions: cognitive and self-referent. It is a characteristic feature of late modernity that the two dimensions interpenetrate each other, and that numerous ways of understanding reflexivity are accepted. Reflexivity is becoming an inalienable competence of an adult individual in late modernity, one that launches the process of his self-creation. On the one hand, reflexivity is connected with undertaking critical reflection over one’s life and its circumstances. On the other hand, it is a feature of social structures or creations of culture which, by evoking a responsive reorganization of an individual’s life, enforce his reaction, reflection, or sometimes even a conscious life change.