Kothamangalam Subbu was an Indian poet, lyricist, author, actor and film director based in Tamil Nadu. He wrote the cult classic Tamil novel Thillana Mohanambal and was awarded the Padma Shri. According to novelist Ashokamitran's memoirs, Subbu functioned as the No. 2 of the giant Gemini Studios of Chennai, South India for over three decades and was a close associate of movie mogul S. S. Vasan, who established those studios and published the popular Tamil weekly Ananda Vikatan.