lThunivu (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 in lead role with Manju Warrier, Samuthirakani, John Kokken, Ajay and Veera in supporting roles.

The film was announced with the tentative title AK61 (Ajith's 61st film in a leading role) in February 2022, the third collaboration between Ajith, Vinoth and Kapoor after Nerkonda Paarvai (2019) and Valimai (2022). Principal photography commenced in April and ended that October, taking place in Hyderabad and Bangkok. The title Thunivu was announced in September. Post-production works began in late-October and were completed that December.

Thunivu was released theatrically in the week of Pongal on 11 January 2023. The film received mixed reviews from critics and was a commercial success.

Cast
Ajith Kumar as Dark Devil
Manju Warrier as Kanmani
Samuthirakani as Dayalan, police commissioner of Greater Chennai Police[7]
John Kokken as Krish[8]
Ajay Kumar as ACP Ramachandran
Veera as Radha[8]
G. M. Sundar as Muthazhagan[7]
Prem Kumar as Prem[8]
Darshan as Kavin
Mahanadi Shankar as Antony, a police constable
Bagavathi Perumal as Inspector Rajesh[8]
Mohana Sundaram as Mai Pa[8]
Bala Saravanan as reporter for A TV
Chirag Jani as Harsha
Rituraj Singh as Sunil Dutta
Sijoy Varghese as Sam Jacob
Amir as Jijo[9]
Pavani Reddy as Achara[10]
Ciby Bhuvana Chandran as Ravi[11]
Birla Bose as Thirunavukarasu, a police officer
Mamathi Chari as the channel head
A. L. Azhagappan as Chief Minister of Tamil Nadu
Kumar Natarajan as Central Minister
G. P. Muthu as a common man
Kaalishwaran as Kavin's father
Padma as Kavin's mother
Nalinikanth as Customer


Director: H. Vinoth
Budget: 2 billion INR
Music composed by: M Ghibran
Producer: Boney Kapoor
Language: Tamil
Distributed by: Red Giant Movies