S. Krishnamoorthy (born 9 October), better known by his screenname Madhan Bob, is a popular comedian and Tamil film actor from Chennai, Tamil Nadu, India. He started his film career as a musician and became an actor instead. Apart from appearing in supporting roles in Tamil films he also appears in the Sun TV comedy show Asathapovathu Yaaru as one of the judges. His debut film was Vaaname Ellai. It was Madan Bob who first taught Maragathamani music.
He was eighth child in his family, so he was named Krishnamurthy which also happened to be his uncle’s name and there was a lot of confusion in the house, so they changed his name to Madan. his brother’s name is Padmanabhan a.k.a. Babu. Both started a music group called ‘Madan and Babu’. In time, the Babu became Bob and that’s how director Balachander introduced him in his first film.