Murappennu is a 1965 Malayalam-language drama film directed by A. Vincent and written by M. T. Vasudevan Nair. The film stars Prem Nazir in the lead role with an ensemble supporting cast including Sharada, Madhu, Jyothilakshmi, K. P. Ummer, P. J. Antony, Jyothilakshmi and Adoor Bhasi playing the pivotal roles. The film revolves around a joint family and the romantic relationships between the cousins of the family. The film explores the Indian custom of marriage between cousins.The film was produced and distributed by Shobhana Parameswaran Nair under the banner of Roopavani Films. It marked the debut of M. T. Vasudevan Nair, the noted Malayalam novelist to Malayalam cinema. The film's story is based on Snehathinte Mukhangal, a short story by Nair himself. He wrote the screenplay, at the behest of the producer. Murappennu became the first Malayalam film to be shot predominantly outdoors; Malayalam films were primarily filmed in Satya or Udaya Studios. Its soundtrack album and background score were composed by Chidambaranath, with cinematography by A. Venkat.

Murappennu was released on 24 December 1965, during the Christmas holiday period. The film was released to high expectations, the film received critical praise for Nair's script, Chidambaranath's music and the performances of Nazir, Madhu and Sharada. It was also commercially successful, with a 175-day theatrical run, becoming a silver jubilee hit. It won the Certificate of Merit for the Third Best Feature Film at the 13th National Film Awards. The film was the first part of Nair's trilogy of political melodramas – the other two being P. Bhaskaran's Iruttinte Athmavu (1967) and Vincent's Asuravithu (1968).