GOS is an element of sustainability for an urban area. GOS Master-Plan have been formaly mandated by Jakarta Medium Term Development Plan Year 2007-2012 and Jakarta Spatial Plan 2030. The aim of this study is to analyze the pattern of stakeholder interaction in formulating GOS Master-Plan. The method of this study used Actor Network Theory (ANT’s) analysis. This paper focuses on the institutionalisation of Master-plan GOS through analysis of stakeholder interactions in Master-plan of GOS in Jakarta. Applying the logic of Actor Network Theory (ANT), this paper discusses emerging networks, key actors, intermediaries, and their interaction process. This study adjusts the ANT concept by limiting the discussions only on human actors (people, institution, agency) and their interaction. Data and information are produced from semistructured interviews and documentary reviews. The conclusion provides dynamic stakeholder interaction maps for Master-plan of GOS institutions, which identify strong engagements of crossboundary Governor, Jakarta Government Agency, Non-Governmental Organization (NGO), academia, audit board, legislatif, private sector, and association. This study uses UCINET network analysis software to draw actor interactions network. Anaylisis is conducted in GOS Master-Plan comparative results of stakeholders interactions map that can be used as consideration materials to draw institutional framewroks. Based on Actor Network Theory (ANT's) analysis, the key actors in the formulation of the GOS Masterplan are Governor, Forest Agency, and Planning Agency.