Sundaram Rajam (10 February 1919 – 29 January 2010) was a distinguished Indian Carnatic musician and painter from the state of Tamil Nadu.

S Rajam was born to Sundaram Iyer and Parvathi alias Chellamma.

Sunderam Iyer was a patron of Papanasam Sivan and many other musicians in Mylapore, Chennai.

He acted in a few more films in the lead role, before becoming a full-time musician - especially renowned for his singing - and painter.

He worked as a staff artist and music supervisor at All India Radio.