Doctor is a 2021 Indian Tamil-language action comedy film written and directed by Nelson Dilipkumar. The film is produced by Sivakarthikeyan under his banner Sivakarthikeyan Productions, whereas KJR Studios only served as the co-producer and distributor. The film stars Sivakarthikeyan, Vinay Rai and Priyanka Arul Mohan, with Archana Chandhoke, Yogi Babu, Milind Soman, Redin Kingsley, Deepa Shankar, Sunil Reddy and Shiva Aravind in supporting roles.

The music is composed by Anirudh Ravichander with cinematography performed by Vijay Kartik Kannan and edited by R. Nirmal. Doctor was released in theatres on 9 October 2021, following multiple delays related to the COVID-19 pandemic. It received positive reviews from critics, grossed over ₹100 crore and became a commercial success at the box office.