Wonosadi Forest is one of the preserved traditional forests in Yogyakarta, closely associated with teh Onggoloco myth that reflect local wisdom in maintaining the sustainability of the Wonosadi Forest. The aim of the research is to analyze factors that have the potential to influence people's belief in the Onggoloco myth, analyze its existence and effectiveness in forest sustainability, and propose social engineering policies to maintain the myth as part of sustainability effort. This research uses mixed methods with logistic regression analysis, gap analysis and stakeholder analysis methods. The research results show that knowledge about myths is the factor that is most likely to influence belief in myths. Until now, myths still exist in society and are effective in maintaining forest sustainability. Therefore, it is necessary to formulate policies in the form of social engineering to maintain the Onggoloco myth in maintaining the sustainability of the Wonosadi Forest, such as including knowledge about the Onggoloco myth in the elementary school curriculum, developing ecotourism edutourism, and making the provisions in the myth into village regulations.
                        
                        
                        
                        
                            
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