Thunivu (transl. Fortitude) is a 2023 Indian Tamil-language action heist film written and directed by H. Vinoth, and produced by Boney Kapoor. It stars Ajith Kumar, Manju Warrier, Samuthirakani and Pavani Reddy with John Kokken, Mamathi Chari, Veera and Bagavathi Perumal in supporting roles.

 The film was announced with the tentative title AK61 (Ajith’s 61st film in a leading role) in February 2022, with the official title announced that September. Principal photography commenced in April and ended in that October, taking place in Hyderabad and Bangkok. Post-production works began in late October and were completed that December. Thunivu was released theatrically on 11 January 2023, in the week of Pongal, and received mixed reviews from critics.