Sundaram Rajam (Tamil: எஸ் ராஜம்; 10 February 1919 – 29 January 2010) was an Indian actor, painter and Carnatic musician from the state of Tamil Nadu. He was a student of the Carnatic musician Papanasam Sivan and the elder brother of Tamil film director and musician Veenai S. Balachander. Rajam made his Tamil film debut in the 1934 film Seetha Kalyanam. He acted in a few more films in the lead role, before becoming a full-time musician and painter. He worked as a staff artiste and music supervisor at the All India Radio. He is known for his series of portraits of the Trinity of Carnatic music. He is also known for popularising Koteeswara Iyer's musical compositions. He was a member of expert committee of the Madras Music Academy.
- Sangeet Natak Akademi Award (in 1991).
- Sangita Kala Acharya By the Music Academy, Chennai.
- Sangeetha Kalasikhamani 2008 by The Indian Fine Arts Society, Chennai
- "S Rajam passes away". Times of India. 30 January 2010. Retrieved 19 March 2010.
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- "Musician S. Rajam passes away". The Hindu. 30 January 2010. Retrieved 19 March 2010.
- "About Shri.S.Rajam". Indian Heritage.com. Retrieved 19 March 2010.
- Randor Guy (5 February 2010). "Rajam's romance with cinema". The Hindu. Retrieved 19 March 2010.
- Ramnarayan, Gowri (5 February 2010). "Extraordinary life". The Hindu. Retrieved 19 March 2010.
- "Rajam: A multifacted personality". Indian Express. 31 January 2010. Retrieved 19 March 2010.