Trichirappalli Krishnasamy Ramamoorthy (15 May 1922 – 17 April 2013) was an Indian Tamil music composer.

Ramamoorthy was known as Mellisai Mannar (Tamil: மெல்லிசை மன்னர்; "The King of Light Music"), along with M. S. Viswanathan. His major works are in Tamil, Malayalam and Telugu films. He and M. S. Viswanathan, as the duo Viswanathan–Ramamoorthy, composed musical scores for over 100 films in the South Indian film industry during the 1950s and 1960s. The duo parted amicably in 1965, but eventually rejoined in 1995 after 30 years for Engirundho Vandhan.

At age 91, he died in a hospital in Chennai on 17 April 2013.