T. N. Sivagnanam Pillai
 Diwan Bahadur Sir Tinnevely Nelliappa Sivagnanam Pillai (b. April 1 1861- d. 1936) was an Indian lawyer civil servant and politician from the Madras Presidency. He belonged to the Justice Party. He served as the Minister of Development in the government of the Raja of Panagal from 1923 to 1926.