Then Sindhudhe Vaanam () is a 1975 Indian Tamil-language film starring Sivakumar and Kamal Haasan. The film was directed by Ra. Sankaran and produced by V. C. Ganesan. It is a remake of the 1973 Malayalam film Ladies Hostel. The film was released on 11 April 1975, in the week of Puthandu.
The music was composed by V. Kumar and lyrics were written by Vaali. Ilaiyaraaja worked as a session guitarist in the song "Unnidam Mayangugiren". Kamal Haasan worked as choreographer in the song 'Yezhuthatha Paadal'.