Unnaithan Thambi is a 1974 Indian Tamil-language film directed by R. Vittal and written by Panchu Arunachalam.
The film stars Jaishankar and Jayachitra in lead roles, alongside notable supporting performances from Ashokan, Srikanth, Thengai Srinivasan, and Vennira Aadai Moorthy.
Jaishankar plays the role of a caretaker who manages a household after its head, Ashokan, loses his vision. He uncovers the treachery of Ashokan's brother-in-law in the process.
The film features music composed by Vijaya Bhaskar and lyrics penned by Kannadasan.
Unnaithan Thambi was released on 30 August 1974, with Kanthan of Kalki offering praise upon its release. The dialogues were noted as being supportive of M. G. Ramachandran.