Andha 7 Naatkal (pronounced [an̪ða eːɻu n̪aːʈkaɭ]; transl.  Those 7 Days) is a 1981 Indian Tamil-language romantic drama film written and directed by K. Bhagyaraj. The film stars Bhagyaraj along with Rajesh and Ambika in lead roles, with Kallapetti Singaram and Master Haja Sheriff in supporting roles. It revolves around a woman (Ambika) who is forced into an arranged marriage with a widower (Rajesh), but still longs for her first love (Bhagyaraj).

The story of Andha 7 Naatkal was inspired by the life of the comedian J. P. Chandrababu; his marriage had failed after his wife revealed to him that she was in love with someone else. The film was produced by P. S. Jayaraman and M. Nachiappan for Srini Creations and presented by Sathya Jyothi Films. The music was composed by M. S. Viswanathan, cinematography was handled by P. Ganesh Pandian, and editing by R. Bhaskaran.

Andha 7 Naatkal was released on 26 October 1981, Diwali day. The film was a commercial success, and Bhaskaran won the Tamil Nadu State Film Award for Best Editor. It became a trendsetter in Tamil cinema for highlighting the importance of traditional values and their relevance in society. The film was remade in Telugu as Radha Kalyanam (1981), in Hindi as Woh Saat Din (1983), and in Kannada as Love Maadi Nodu (1989).