Daag: A Poem of Love (transl. smear) is a 1973 Indian Hindi-language romantic drama film produced and directed by Yash Chopra in his debut as a producer, which laid the foundation of Yash Raj Films. It is an adaptation of the 1886 Thomas Hardy novel The Mayor of Casterbridge. The film stars Rajesh Khanna, Sharmila Tagore and Raakhee in lead roles, with Madan Puri, Kader Khan, Prem Chopra and A. K. Hangal.Daag was made at the peak of the Rajesh Khanna's craze and became a superhit at the box office. The music by Laxmikant Pyarelal dominated the charts for the year. The film was later remade into the Telugu film Vichitra Jeevitham (1978). This film was Kader Khan's debut as an actor.At the 21st Filmfare Awards, Daag: A Poem of Love received 7 nominations, including Best Film, Best Actor (Khanna) and Best Actress (Tagore), and won 2 awards – Best Director (Chopra) and Best Supporting Actress (Raakhee).

Chopra used Raakhee's character name Chandni from this film also in his later films Silsila (1981) and Chandni (1989).