Thai Sollai Thattathe () is a 1961 Indian Tamil-language action drama film directed by M. A. Thirumugam. The film stars M. G. Ramachandran and B. Saroja Devi, with M. R. Radha, S. A. Ashokan, V. R. Rajagopal, and P. Kannamba in supporting roles. It revolves around a police officer who is tasked with apprehending his brother, a criminal.
Thai Sollai Thattathe was produced by Sandow M. M. A. Chinnappa Thevar, and written by Aaroor Dass. The film was released on Diwali, on 7 November 1961, and was a commercial success, running for 20 weeks in theatres.
Raju is an honest police inspector working hard to apprehend a group of thieves. After completing a successful mission, he is transferred to Madras to investigate a train robbery and a murder that occurred near the seashore. He crosses paths with Vijaya, the daughter of a banker named Pandithurai, and they both fall in love. What happens after Raju realizes that the criminal he is hunting is none other than his brother, forms the crux of the story.
Thaai Sollai Thattathe was edited and directed by M. A. Thirumugam and produced by M. M. A. Chinnappa Thevar under Thevar Films. The script was written by Aaroor Dass and the cinematography was handled by C. V. Murthi. The film saw Ramachandran and Thevar collaborating again after a brief misunderstanding. Production was completed in one month.
The music was composed by K. V. Mahadevan, with lyrics by Kannadasan. The song "Kaattukulle Thiruvizha" attained popularity.
Thai Sollai Thattathe was released on 7 November 1961, and ran for 20 weeks in theatres. According to R. Kannan, the author of the biography MGR: A Life, the film helped rehabilitate Ramachandran's "image as a dutiful actor". Kanthan of Kalki praised the story and some of the cast performances but criticised the music and felt the film should have been faster paced.