Na. Parthasarathy (18 December 1932 - 13 December 1987), was a writer of Tamil historical novels from Tamil Nadu, India. In 1971, he was awarded the Sahitya Akademi Award for Tamil for his novel Samudhaya Veedhi. He was also a journalist who worked in Kalki, Dina Mani Kadhir and later ran a magazine called Deepam. He was known as Deepam Parthasarathy due to his magazine. He also published under various pen names like Theeran, Aravindan, Manivannan, Ponmudi, Valavan, Kadalazhagan, Ilampooranan and Sengulam Veerasinga Kavirayar.