Thangaikkaaga () is a 1971 Indian Tamil-language film directed by D. Yoganand. The film stars Sivaji Ganesan, Vennira Aadai Nirmala, and Lakshmi. It was released on 6 February 1971.
Ramu and his sister Radha lead a normal life until Ramu's boss, Moorthy, falls in love with Radha. However, in a shocking turn of events, Radha goes missing and Moorthy is murdered.
The music was composed by M. S. Viswanathan, with lyrics by Kannadasan. The song "Angamuthu" belongs to baila, a Sri Lankan music genre.