Good Bad Ugly (also known by the initialism GBU) is a 2025 Indian Tamil-language action comedy film directed by Adhik Ravichandran and produced by Mythri Movie Makers, marking their first production in Tamil cinema. The film stars Ajith Kumar, alongside Trisha Krishnan, Arjun Das, Sunil, Karthikeya Dev, Priya Prakash Varrier, Prabhu, Prasanna, Tinnu Anand and Raghu Ram. It is about a retired gangster who returns to his violent ways after his son is wrongfully convicted.

Presented by T-Series, the film was announced in late 2023 under the working title AK63, as it is Ajith's 63rd film as lead actor, and the official title was announced in March 2024. Principal photography commenced the following May in Hyderabad along with a sporadic schedule in Spain, and wrapped by early December. The film has music composed by G. V. Prakash Kumar, cinematography handled by Abinandhan Ramanujam and editing by Vijay Velukutty.

Good Bad Ugly was released worldwide on 10 April 2025 in standard and EPIQ formats. The film opened to mixed reviews from critics who noted that it struggled to balance homages to Ajith's previous films with storytelling. However, it emerged the highest grossing Tamil film of 2025.