Periyasekkadu (or Peryasekadu) is a neighbourhood of Chennai in Thiruvallur district in the state of Tamil Nadu, India. Periyasekkadu used to be a part of Madhavaram Municipality in Thiruvallur district. In 2011, Madhavaram Municipality was merged with Chennai Corporation. Peryasekadu comes under ward 28 in Zone 3 (Madhavaram) of Chennai Corporation. It forms part of the Madavaram Assembly segment within Tiruvallur constituency for elections to the Lok Sabha.