Avvai Shanmugi is a 1996 Indian Tamil-language comedy film directed by K. S. Ravikumar and co-written by Crazy Mohan. The film stars Kamal Haasan and Meena, with Gemini Ganesan, Nagesh, Heera, Manivannan, Nassar, Delhi Ganesh and Ann in supporting roles. It is an unofficial remake of the American film Mrs Doubtfire (1993). The film revolves around a divorcé who disguises as a nanny to be close to his daughter, whose custody is only with his ex-wife.

Avvai Shanmughi was released on 10 November 1996 and became a box office success, winning two Tamil Nadu State Film Awards: Best Make-up Artist (K. M. Sarathkumar) and Best Child Artist (Ann). A year later, the film was remade in Hindi as Chachi 420, with Haasan directing and reprising his role.