Achan (transl. Father) is a 1952 Indian Malayalam-language film, directed by M. R. S. Mani and produced by M. Kunchacko. The film stars Prem Nazir and B. S. Saroja in lead roles. The film had musical score by P. S. Divakar. This was the only film in which veteran actor Sesbastian Kunjukunju Bhagavatahar did a comic role. It is one of the major box office hits of early Malayalam cinema. It will be remembered as the debut of Boban Kunchacko, the maiden venture of XL Productions, and first film of Thiruvananthapuram V. Lakshmi. The film was remade in Tamil as Thanthai, again with Prem Nazir. Kambadasan wrote the dialogues and lyrics. The film was released in April 1953.

B. S. Saroja is an Indian actress in Malayalam and Tamil films. She is the daughter of Johnson, who acted in the first Malayalam film, Vigathakumaran. She acted with MGR and Sivaji in their only movie together, Koondukkili. Apart from Koondukkili, B.S. Saroja also was the heroine in two more MGR movies, namely "Genoa" and "Puthumai Pithan" of 1950s.