Melnaattu Marumagal () is a 1975 Indian Tamil-language film directed by A. P. Nagarajan, starring Sivakumar, Laurance Pourtale, Kamal Haasan and Jayasudha. Vani Ganapathy, a danseuse appeared only for a dance sequence alongside Haasan, whom she later married in 1978. The film was released on 10 May 1975. In 1976, it was remade in Telugu as America Ammayi.
The film is about two brothers, Mohan and Raja, and their spouses. Sivakumar marries a European girl who admires Tamil culture and tradition. Meanwhile, Raja marries a Tamil girl who is attracted to Western customs.
Melnaattu Marumagal was directed by A. P. Nagarajan, and produced by C. N. Venkatasamy under C. N. V. Movies.
The music was composed by Kunnakudi Vaidyanathan. Viji Manuel was the film's keyboardist.
Kanthan of Kalki praised the performances of Sivakumar, Kamal Haasan, Poornam Viswanathan but felt none of the songs stay in the mind and called the cinematography as average.