Lakshmi Vanthachu is a 1986 Indian Tamil-language comedy drama film directed by Rajasekhar.
The film stars Revathi in the title role along with Sivaji Ganesan and Padmini, and is a remake of the 1980 Hindi film Khubsoorat.
The story follows Rajeshwari, a strict disciplinarian who keeps her family under control. When Lakshmi, her second son's wife's younger sister, comes to stay with the family, she brings a carefree and easy-going attitude that endears her to the family but puts her at odds with Rajeshwari.
Raja, the third son, falls in love with Lakshmi, leading to a crisis that sets things in motion to solve all the problems.
The film was released on 1 November 1986 and features music composed by Raveendran.