Deedar is a 1951 Hindi-language romantic musical film directed by Nitin Bose, starring Nargis, Ashok Kumar, Dilip Kumar and Nimmi. It is a story of unfulfilled love, where the hero's childhood love is separated from him due to class inequalities. It is one of noted tragedies made in early Hindi cinema. It became a popular film of the Golden era and further established Dilip Kumar as the "King of Tragedy".

Many years later, when Deedar was having a rerun at Mumbai theatres, actor Manoj Kumar asked director Raj Khosla to accompany him to the show. Thereafter, the story of Do Badan (1966) was written after reworking its story line, that film was also a hit. It is referred to repeatedly in the Vikram Seth's 1993 novel A Suitable Boy, in which people watching it burst into tears and people who can't get tickets start a riot. The film was remade in Tamil as Neengadha Ninaivu (1963) and in Turkish as Seven Unutmaz (1978).