Thiruvennainallur is a taluk in Viluppuram district in the Indian state of Tamil Nadu.

Thiruvennai nallur new taluka is formed headquarters at thiruvennai nallur 3 Firkas (66 villages) vtz., Thiruvennainallur (30 svillage), Sithilangamadam (12 villages) existing Thirukkoilur taluk and Arasur (24 villages) of the existing Ullundurpettai taluka are attached with villuppuram revenue and Villuppuram district announced on 12.11.2019.

Kripapureeswarar Temple located here is managed by Hindu Religious and Charitable Endowments Department of Tamil Nadu Government.

(one of the oldest shiva temple) The Tamil poet Vennaivelan belongs to Thiruvennainallur.

The writer of Siva Gnana Bodham, Meykanda Nayanar (earlier name: Suvethana Perumal), was born in Thirupennākadam.