Ombathuveli Subrahmanyam Thyagarajan (3 April 1947 – 31 December 2023) was an Indian carnatic musician based in Chennai.

He learnt music from Sangeetha Kalanidhi T. M. Thiagarajan, while Padmabhushan Lalgudi Jayaraman provided guidance/mentorship early in his career.

He was regularly featured by all leading sabhas in Chennai as well as throughout India and was accompanied by top accompanists such as Lalgudi Shri.G.Jayaraman, M.S.

Subrahmanyam on violin, Palghat Mani Iyer, Dr T.K.Murthy, Palghat Raghu, Karaikudi Mani, Trichy Sankaran, Umayalpuram Sivaraman on mridangam, Shri.G Harishankar on Kanjira and Vikku Vinayakaram on Ghatam.

He worked as Dean and Faculty of Fine Arts at Annamalai University for 5 years.