Thaai Nadu is a 1947 Indian Tamil-language film directed by T.S. Mani and produced under Chitrakala Movietone by S.M. Nayagam. The film stars Battling Mani in the lead role, alongside prominent actors such as S.T. Williams, V.P.S. Mani, T.K. Krishnaiah, M.R. Sundari, and N.C. Meera.
The movie features a cast of notable actors and was produced by S.M. Nayagam, who also produced the first Sinhala talkie "Kadawunu Poronduwa". The film's story and screenplay were written by T.S. Mani, while dialogues were penned by T.V. Natarajasamy.
The soundtrack of Thaai Nadu was composed by R. Narayana Iyer, with lyrics written by T.V. Natarajasamy for the song "Engal Indhiya Bharathiye", sung by V.N. Sundaram and A.P. Komala.