Mannathu Padmanabhan (January 2, 1878 - February 25, 1970) was a social reformer and a freedom fighter from the State of Kerala, India. He is recognised as the founder of the Nair Service Society, which claims to represent the Nair community that constitutes almost 14.5% of the population of the state. Padmanabhan is considered as a visionary reformer who organised the Nair community under the NSS.