Mamankam festival or Mamangam festival (Malayalam: മാമാങ്ക മഹോത്സവം) is an age old festival of ancient Kerala, staged every 12 years and lasting 28 days, during the time of Kulasekharas (Chera dynasty) from the 14th century till 18th century. The venue of the festival was Thirunavaya, on the banks of River Bharathapuzha in Malabar, Northern Kerala in South India. The festival is remembered for the great trade fair associated with it as well as the bloody battles occurred during the festival.