Olangal: His Malayalam directorial film Olangal was later adapted to Hindi as Masoom by Shekhar Kapur. Olangal stars Amol Palekar, Poornima and Ambika. Amol and Poornima play a married couple who are leading a happy life with their only daughter. Life changes for them when Amol's lovechild appears on the scene.
Thalaimuraigal: Balu Mahendra's last Tamil directorial Thalaimuraigal was a befitting farewell to his illustrious career. The film was not a box office winner but was lauded by critics. The master himself acted in this one. It starred Sashi Kumar Subramani as Sivaraman and Ramya Shankar as Stella.
In the film Balu Mahendra mentors a city bred child of a doctor couple and helps him learn Tamil culture.
Kokila: In 1977, Balu wielded the megaphone for the Kannada romantic-drama Kokila, which was also written by him. The film won the Karnataka State Award for the best screenplay. It starred Kamal Haasan, Mohan and Shoba. It tells the story of a medical student Kokila who falls in love with her paying guest Vijayakumar.