Swami Vivekananda was the pioneer of the 19th century renaissance by religious revolution in India. He was one of the foremost leaders who were very much concerned about the poor and subjugated persons of the society. Vivekananda realized that there is need of reformation in society. Vivekananda wanted to revive the lost confidence of the common people in society. He visited extensively within the country to understand their problem. He wanted to eliminate all the social evils of the society which are major obstacles for the mankind. These social evils are poverty in general, untouchability, illiteracy, intolerance, religious superstitions etc. He always pleaded for the fraternity, humanity and harmony. He realized that the ultimate goal can be achieved through self-development of human values, not only by laws. In this short discourse, I would like to highlight Vivekanada’s philosophical realization towards the mankind and his ideo of Rerormation. KEYWORDS- Reformation, Untouchability, Self-realization, Harmony, Humanism, Brahman, Narayana, Brotherhood.