Mathilukal (transl. Walls) is a 1990 Indian Malayalam-language film written, directed, and produced by Adoor Gopalakrishnan based on the autobiographical novel of the same name by Vaikom Muhammad Basheer. The film focuses on the prison life of Vaikom Muhammad Basheer and the love between him and Narayani, a female inmate of the prison, who remains unseen throughout the film. Mammootty plays the role of Vaikom Muhammad Basheer while K. P. A. C. Lalitha gives voice to Narayani. The film was screened at the Venice Film Festival.

On the centenary of Indian cinema in April 2013, Forbes included Mammootty's performance in the film on its list, "25 Greatest Acting Performances of Indian Cinema".