Nysa, 13, is Ajay and his actress wife Kajol's daughter. The couple also have a son, Yug.
The father-daughter duo attended the opening night at Cineworld Cinemas in London.
Empowering the girl child. Walking the red carpet with my power besides me. She's my true strength #MyGirlMyStrength pic.twitter.com/BOPU4haYnR
— Ajay Devgn (@ajaydevgn) July 14, 2016
The 47-year-old "Drishyam" actor was dressed in a black suit and his daughter, who made her red carper debut, looked pretty in a navy blue, off-shoulder dress.
"Empowering the girl child. Walking the red carpet with my power besides me. She's my true strength #MyGirlMyStrength," Devgn posted alongside a picture with his daughter from the red carpet.
In its seventh edition, London Indian Film Festival, which is known as the largest event of South Asian movies, will have film screenings across London and Birmingham.
The festival will run till July 24.