The 'Mopin' or Moopin festival is an agricultural festival celebrated by the Galo tribe of Arunachal Pradesh, India in particular of the Galo group of tribes which resides in East Siang and West Siang districts. It is a celebration of the harvesting season held in the Galo months of "Lumi" and "Luki", corresponding to March–April and the new year for the Galo tribe. The Galo tribe follow an animist religion called Donyi-Polo.