Thyagaraya Nagar, commonly known as T. Nagar, and historically known as East Mambalam, is a very affluent commercial and residential neighbourhood in Chennai, Tamil Nadu, India. It is surrounded by Nungambakkam in the North, Teynampet in the East, Nandanam in the South-East, C.I.T. Nagar in the South and West Mambalam and Kodambakkam in the West. The stretch between Duraiswamy Road and T. Nagar Bus Stand has some of the costliest real estates in Chennai.