| தமிழ்த்தாய் வாழ்த்து | |
| Transcription: | Tamil Thai Valthu |
| English Title: | Invocation to Mother Tamil |
| Type: | song |
| Prefix: | State |
| Country: | Tamil Nadu |
| Author: | Manonmaniam Sundaram Pillai |
| Composer: | M. S. Viswanathan |
| Adopted: | de facto 23 November 1970 de jure 17 December 2021 |
Tamil Thai Valthu (; in Tamil pronounced as /t̪ʌmɪ˞ɻt̪ːɑːɪ̯ ʋɑ˞ːɻt̪ːɨ/) is the state anthem of Tamil Nadu.[1] The song was written by Manonmaniam Sundaram Pillai, and composed by M. S. Viswanathan.[2] Ever since the Tamil Nadu government under M. Karunanidhi issued an order on 23 November 1970,[3] the official functions of the Government of Tamil Nadu, and those functions organised by educational institutions and public establishments, have started with this song, and ended with the Indian National Anthem. The song is sung daily in schools all over Tamil Nadu during the assembly in the morning.
On 17 December 2021 the Tamil Nadu government under chief minister M.K.Stalin, formally declared the song as the official state song, stating that it would be sung at all public events in educational institutes and government offices. Except for disabled people, everybody will have to stand when it is played or being sung.[4]