Mission: Chapter 1 (also marketed as Mission: Chapter 1 – Achcham Enbadhu Illaiye) is a 2024 Indian Tamil-language action thriller film directed by A. L. Vijay, written by A. Mahadev and produced by Lyca Productions, Shri Shirdi Sai Movies, New March Fast Pictures and Aspen Film Productions (P) Ltd. The film stars Arun Vijay, Amy Jackson and Nimisha Sajayan alongside Abi Hassan, Bharat Bopana and Iyal in the ing roles. This marks Jackson's comeback Tamil film after a five-year hiatus.

The film was officially announced in October 2022 under the title Achcham Enbadhu Illaiye, but the title was later announced as Mission: Chapter 1 – Achcham Enbadhu Illaiye in April 2023 after a production change. Principal photography commenced in October 2022 and wrapped in February 2023. The music was composed by G. V. Prakash Kumar, cinematography was handled by Sandeep K. Vijay and editing by Anthony.

Mission: Chapter 1 – Achcham Enbadhu Illaiye was released on 12 January 2024, during Pongal weekend, to mixed-to-positive reviews from critics and became a box office success.