This final report documents and summarizes the main findings of the project on “Leveraging Behavioural Nudges to Improve Waste Collection at the Gorkhi-Terelj National Park” implemented during August 2017 and September 2018. The main purpose of the project was to increase the waste collection rate at Gorkhi-Terelj National Park (GTNP) through an effective implementation of behavioural interventions targeted at holiday makers or tourists visiting the park. The project activities consisted of 3 phases: (1) conducting a baseline study of the target area, which included a detailed analysis of the waste generation rate and gave insight into the waste disposal behaviour of visitors; (2) designing the behavioural interventions with a detailed trial methodology targeting the visitors; (3) implementing the behavioural interventions and developing policy recommendations informed by behavioural insights.