M. Krishnan Nair (1939 – 28 October 2021) was an Indian oncologist. He was the founding director of the Regional Cancer Centre, Thiruvananthapuram, a director of the S.U.T. Institute of Oncology, and Trivandrum Cancer Center(TCC), part of SUT Royal Hospital in Thiruvananthapuram (Trivandrum) and a professor at the Amrita Institute of Medical Sciences & Research in Kochi. The Government of India awarded him the fourth highest civilian award of the Padma Shri, in 2001 for his contributions in the cancer care field.