S. Krishnamoorthy, better known by his screen name Madhan Bob, is a Tamil comedian and actor. He started his film career as a musician and then became an actor. Apart from appearing in supporting roles in Tamil films, he also appeared in the Sun TV comedy show Asathapovathu Yaaru as one of the judges. His debut film was Vaaname Ellai. He also taught music to M. M. Keeravani.