Younger Sister) is a 1967 Indian Tamil-language action film, directed by A. C. Tirulokchandar and produced by Balaji.

The film stars Sivaji Ganesan and K. R. Vijaya, Kanchana with K. Balaji, Nagesh in supporting roles.

[citation needed] Thangai was Sivaji Ganesan's first film under A. C. Tirulokchandar's direction.

[4] He was initially reluctant to accept the film due it being in the action genre and he was then known mainly for his dramatic films, but after producer Balaji assured him it would reinvent his image, he relented.

[8] Kalki appreciated the film for showcasing Ganesan in a new kind of role.