Thiruvallur Lok Sabha constituency is a newly formed Lok Sabha (Parliament of India) constituency after the 2008 delimitation.

Its Tamil Nadu Parliamentary Constituency number is 1 of 39.

It was formed after merging the assembly segments of Gummidipoondi, Ponneri (SC), Tiruvallur, and Poonamallee (SC), Madhavaram, which were earlier parts of Sriperumbudur constituency and the newly formed Avadi.

[2] The constituency had previously existed for three elections from 1951 to 1962.

It is reserved for Scheduled Castes (SC).