Pararajasingam "Park" Nadesan, CMG, OBE (20 December 1917 - ) was a Ceylonese civil servant.
He joined the Ceylon Civil Service in June 1941 as a cadet on appointment of the Governor.
In 1953, he succeeded Nandasara Wijetilaka Atukorala as secretary to the prime minister.
The post of Secretary to the Prime Minister was abolished and Nadesan allowed to retire early.
Gunasena de Soyza, Permanent Secretary to the Ministry of External Affairs and Defence officially took over assisted by Bradman Weerakoon, who was the assistant secretary to the prime minister at the time.