- Ragahavan, V. S.
- Raghunathan, K.
- Raghunathan, M. B.
- Raghuraman, M.
- Rajagopal, C. K.
- Rajan
- Rajan, V. J.
- Rajaram, A.
- Rajendran, Dr. M. V.
- Rajendran, M. V.
- Rajendran, Prof. M. V.
- Ramakanth, M.
- Ramakrishna, C.
- Ramalingam, K.
- Raman, V. J.
- Ramanan, P.
- Ramanathan
- Ramanathan, B.
- Ramesh, Divya
- Ramesh, S.
- Rangarajan, P. M.
- Rangaswami, S.
- Rao, A. N. Jaganatha
- Rao, Irde Shankar
- Rao, K. Mrutyumjaya
- Rao, K. R.
- Rao, K. Ramachandra
- Rao, Koneri
- Rao, Mohan
- Rao, R. V. Mohan
- Rao, T. Koneri
- Rao, V. Mohan
Madras Naturalists' Society
