Doctor is a 2021 Indian Tamil action thriller film directed by Nelson Dilipkumar. The film stars Sivakarthikeyan who also produced it under his banner Sivakarthikeyan Productions, whereas KJR Studios served as the co-producer and distributor.

The film also stars Vinay Rai, Priyanka Arul Mohan (in her Tamil debut), Yogi Babu, and Milind Soman, with music composed by Anirudh Ravichander, cinematography performed by Vijay Kartik Kannan, and editing by R. Nirmal. Despite multiple rumors that the film would release on over-the-top platforms, the film was released in theatres on October 9th, 2021.

The film received positive reviews with praise for the primary performances, dark humor and comedy, direction, storyline, soundtrack, and background score.