This thesis adopts an empirical approach to investigate the role of non-state actors in promoting compliance with the World Heritage Convention.The study focusses on the Great Barrier Reef and traces Australia's interactions with the World Heritage Committee and other relevant institutions between the years 2010 and 2015. To make sense of the empirical data, the study draws upon theories like 'enrolment' and 'compliance pull' to show how non-state actors can take part in regulatory activities such as monitoring and enforcement. Enrolment is a theory that helps to explain the activities of non-state actors in 'regulation' (which includes the activities of rule making, monitoring and enforcement). Compliance pull is a theory that conceptualises the rules, relationships, behaviours and influences of governmental, intergovernmental and non-governmental organisations in contributing to compliance. Where a formal invitation to regulate is not forthcoming, this thesis shows how non-state actors can nevertheless enrol themselves in the World Heritage regime. The key to understanding nonstate actor influence, it seems, is the issue of legitimacy. This study demonstrates how nonstate actors are able to construct their own legitimacy and assert their own authority by building relationships and deploying expertise at discrete times. This study finds that certain non-state actors can be defined as 'regulators' -(whether they are formally enrolled or enrol themselves) whilst others are situated outside of the regulatory process and concern themselves with advocacy and lobbying. We can consider the latter category of non-state actors to be 'agitators' though equally capable of contributing to compliance pull under the Convention. Overall, the findings in this thesis have relevance for the broader regulatory and compliance literature as well as making sense of how the World Heritage Convention operates after a site has been listed.