Dr. C. Natesa Mudaliar (1875–1937), also known as Natesan, was an Indian politician and activist of the Dravidian Movement from what is now the Indian state of Tamil Nadu. He was one of the founders of the Justice Party, along with P. Theagaraya Chetty and Dr. T. M. Nair. He is often mentioned as Dravida Thanthai.

The Justice Party, officially the South Indian Liberal Federation, was a political party in the Madras Presidency of British India. It was established on 20 November 1916 in Victoria Public Hall in Madras by Dr C. Natesa Mudaliar and co-founded by T. M. Nair, P. Theagaraya Chetty and Alamelu Mangai Thayarammal as a result of a series of non-Brahmin conferences and meetings in the presidency. Communal division between Brahmins and non-Brahmins began in the presidency during the late-19th and early-20th century, mainly due to caste prejudices and disproportionate Brahminical representation in government jobs. The Justice Party's foundation marked the culmination of several efforts to establish an organisation to represent the non-Brahmins in Madras and is seen as the start of the Dravidian Movement.