Needamangalam or Nidamangalam, is a town panchayat in Thiruvarur district in the Cauvery Delta of the Indian state of Tamil Nadu.

According to Poruna-raatr-uppadai, Karikala Chola fought Battle of Venni (now Kovilvenni) near Needamangalam in which both Pandya and Chera suffered crushing defeat.

Besides the two crowned kings of the Pandya and Chera countries, eleven minor chieftains took their side in the campaign and shared defeat at the hands of Karikala.

Venni was the watershed in the career of Karikala which established him firmly on his throne and secured for him some sort of hegemony among the three crowned monarchs.

Needamangalam experiences abundant rainfall during rainy season and severe weather drop towards November and December of every year.

There is a long pending demand for a ROB at Needamangalam Junction which is announced during 2013-14 budget by Tamil Nadu Government and work in progress.