The Great Himalayan National Park (GHNP) is situated in the kullu district of Himachal Pradesh. The park have been blessed with distinct biodiversity, flora & fauna; and is inscribed in the UNESCO world heritage site list in June, 2014. The Great Himalayan National Park (GHNP), Kullu, Himachal Pradesh is one of the best ecotourism destination in the state. The GHNP organizes various adventurous activities like trekking, wildlife viewing, bird watching, Rafting, Climbing, Mountain biking, local sightseeing etc. Local community involvement is very important for the execution and development of ecotourism in the destination and they provide the exact feedback about the improvements and developments in the region. This paper tries to analyze the local community’s perception about impacts on ecotourism by UNESCO world heritage designation in Great Himalayan National Park..