This volume 20 in the IUCN Best Practice Protected Area Guidelines series argues that governance that is both appropriate to the context and “good” is crucial for effective and equitable conservation. This applies to all kinds of protected areas and other conserved areas, in terrestrial, inland waters, coastal and marine environments. Addressing an issue that was barely recognised until recently, the Guidelines represent an important step towards integrating good governance into the conservation agenda. Over the past decades there has been a dramatic change in understanding about how governance of protected areas impacts on the achievement of their conservation goals. IUCN has defined four different forms of governance of protected areas. Along with the familiar state-run protected areas, managed by government employees, there are protected areas established and managed by indigenous peoples, local communities, ecotourism organisations, nonprofit trusts, private individuals, commercial companies and religious institutions, as well as a wealth of shared-governance arrangements between them. Finding the right mix of governance types within a protected area system and improving the quality of governance of individual sites remains one of the key challenges for bridging the implementation gap in CBD’s Programme of Work on Protected Areas, particularly in relation to effective participation, human rights, equity and benefit sharing. Part 1 of the publication deals with concepts and principles to understand the four main protected area governance types recognised by IUCN, featuring numerous examples from all over the world, and their role in the wider conservation landscape; as well as outlining criteria for quality of protected area governance. Part 2 offers practical guidance for countries willing to embark on the process of assessing, evaluating and improving governance for their systems of protected areas or for individual protected area sites.