Tumsa Nahin Dekha (English: Saw nobody like you) is a 1957 Indian Hindi language romance drama film, produced by Sashadhar Mukherjee while written and directed by Nasir Hussain, of Filmistan Pvt. Ltd. The film marked Hussain's evolution into a director. He had written films such as Munimji and Paying Guest.

The film was conceived as a star vehicle for its heroine Ameeta, who was the protégée of Filmistan Studios owner Tolaram Jalan. Much care was taken with her make-up, wardrobe and lighting. Much of the film's extensive publicity was also built around the actress.

The film's huge success at the box office made the then-struggling Shammi Kapoor an overnight sensation instead. This was the film in which he developed his own individual look and youthful style, and was his first light-hearted musical and its success helped move him to acting in this genre. The film also stars the popular villain and character actor Pran. Its music is by O.P. Nayyar and lyrics by Majrooh Sultanpuri.

The film was originally offered to Dev Anand, but he declined, due to which Shammi Kapoor was cast. However, the director Nasir Hussain was in a quandary as he had already read the script to Dev Anand and Vyjayanthimala, but Mukerji prevailed and he also replaced Vyjayanthimala with Ameeta, who was the protégée of Filmistan Studios owner Tolaram Jalan. The film's original lyricist was Sahir, who wrote the title song, but he too opted out and Majrooh Sultanpuri took his place.