Dheerga Sumangali (transl. Eternally Married Woman) is a 1974 Indian Tamil-language drama film co-written and directed by A. C. Tirulokchandar. The film was produced by N. S. Rajendran under Visalakshi Combines and stars K. R. Vijaya and Muthuraman, while Major Sundarrajan, V. K. Ramasamy and Sivakumar play supporting roles. The film's soundtrack and background score were composed by M. S. Viswanathan, while the lyrics for the songs were written by Kannadasan and Vaali.

M. Viswanatha Rai and B. Kandasamy handled cinematography and editing respectively. The film's story was written by G. Balasubramaniam and the dialogues were written by Karaikudi Narayanan. The film was released on 12 April 1974. It was remade in Telugu with the same name (1974), in Kannada as Bhagyavantharu (1977), in Malayalam as Aayiram Janmangal (1976) and in Hindi as Sadaa Suhagan (1986).