P. G. N. Unnithan (1898 – 5 April 1965) was the last Diwan (Prime Minister) of independent Travancore. He succeeded C. P. Ramaswami Iyer on 20 August 1947 following the latter's resignation (subsequent to the attempt on Iyer's life at the Swathi Thirunal Music Academy on 25 July 1947). He chaired the Travancore Constitutional Reforms Committee. He relinquished office on 24 March 1948 when people's government led by Pattom Thanu Pillai as Prime Minister took over.