Maanaadu (transl. Public Conference) is a 2021 Indian Tamil-language science fiction action thriller film directed by Venkat Prabhu and produced by Suresh Kamatchi. The film stars Silambarasan, leading an ensemble cast which includes S. J. Suryah, Kalyani Priyadarshan, S. A. Chandrasekhar, Y. G. Mahendran, Karunakaran, Premgi Amaren, Aravind Akash and Anjena Kirti. It follows an NRI and a police officer who are trapped in a time loop, on the day of a public conference, and forced to live the same day over and over again.

The film was officially announced in July 2018, in addition to its official title and marking Prabhu's maiden collaboration with Silambarasan. However, due to Silambarasan's unprofessional behaviour, which caused an extensive pre-production work, the producer ousted the actor in August 2019. The issues were resolved in November 2019, with principal photography commencing in February 2020. It was shot in Chennai, Pondicherry, Yercaud, and Hosur. Despite being affected twice due to restrictions related to the COVID-19 pandemic in India, filming wrapped by July 2021.

Maanaadu was released on 25 November 2021 in theatres and received widespread acclaim from critics and audiences. The film was praised for the integration of the time loop concept with commercial elements, with many publications calling it one of the best Tamil films of all time and one of the best Indian films of 2021, and was declared a huge critical and commercial success. A sequel was confirmed by Venkat Prabhu with the main cast returning.