M. Krishnan Nair

• M. Krishnan Nair (author), Indian Malayalam literary critic and orator
• M. Krishnan Nair (doctor), Indian oncologist, director of the Regional Cancer Centre in Thiruvananthapuram, Kerala
• M. Krishnan Nair (director), Indian film director of Malayalam films
• M. Krishnan Nair (politician), Indian politician, member of Madras Legislative Council