Sir Pitti Theagaraya Chetty KCSI (27 April 1852 – 28 April 1925) was an Indian lawyer, industrialist and a prominent political leader from the erstwhile Madras province. He was one of the founders of the Justice Party in 1916 along with C. Natesa Mudaliar, Dr. T. M. Nair. T.Nagar is a locality in Chennai which is named after him. On 1919 January 1, the title Dewan Bahadur was awarded to him