Oppol (English: Elder Sister) is a 1981 Malayalam-language drama film, produced by Rosamma George under the banner of JMJ Arts, directed by K. S. Sethumadhavan and written by M. T. Vasudevan Nair. The film stars Balan K. Nair, Menaka and Master Aravind in the lead roles. The film features original songs composed by M. B. Sreenivasan. The film was based on a short story of the same name written by M. T. Vasudevan Nair in 1975. The film revolves around Malu and her brother Appu. Malu marries Govindan and shifts to his house along with her brother. Appu however, becomes jealous of Govindan because he suspects that he will isolate him from his sister. The rest of the film deals with how they mend their relationship.

The film was released in theaters on 2 April 1981 to critical acclaim. The film was also a major commercial success and went on to become the second highest grossing Malayalam film of the year behind Kolilakkam. The film won three National Awards for Best Actor (Balan K. Nair), Best Child Artist (Master Aravind) and Best Female Playback Singer (S. Janaki). The film also won two State Awards for Best Film and Best Director (K. S. Sethumadhavan). The film is now considered a classic in Malayalam cinema and it also marked the official debut of veteran actress, Menaka G. Suresh (the mother of actress, Keerthy Suresh and the wife of Malayali producer, G. Suresh Kumar who made a future mark in further Mollywood industry until her marriage in the late-80s)