Periya Idathu Mappillai () is a 1997 Indian Tamil language comedy film directed by Guru Dhanapal. The film stars Jayaram, Goundamani, Manivannan, Devayani and Mantra. It was released on 22 August 1997. The film is a remake of the Malayalam film Aniyan Bava Chetan Bava.
Periya Thambi and Chinna Thambi are brothers and owners of a company. Gopalakrishnan is from a poor family and despite being a graduate, he cannot find a job. To support his family, he becomes the driver of Periya Thambi and Chinna Thambi. Periya Thambi's daughter Lakshmi and Chinna Thambi's daughter Priya fall in love with Gopalakrishnan. What transpires later forms the crux of the story.
During the shoot of Periya Idathu Mappillai, Guru Dhanapal was simultaneously making another film with Jayaram titled Raja Magal which did not release.
The music was composed by Sirpy. The song "Kadhalin Formula" was inspired from the Arabic artist Amr Diab's album Nour El Ain.