T.N. Rajarathnam Pillai
 Thiruvavaduthurai Thirumarugal Natesapillai Rajarathinam Pillai (Tamil: T N ராஜரத்தினம் பிள்ளை (27 August 1898 – 12 December 1956) was a Carnatic musician in South India a Nadaswaram maestro and a vocalist. He was popularly known as TNR by his initials. He redesigned the traditional Nagaswaram instrument replacing the timiri with the bari nayanam for instance which he improved substantially as well. He was titled by the music lovers with Nadaswara Chakravarthi (Emperor of Nadaswaram)