Thodur Madabusi Krishna (born 22 January 1976) is a Carnatic music vocalist, writer, activist and author. As a vocalist, he has made a large number of innovations in both the style and substance of his concerts, thereby inviting controversy from some quarters. As an activist, he has championed a number of causes connected to the environment, the caste system, communalism, religious reform, reform of social practices and so on.