The research aimed to examine economic, socio-cultural, and environmental impacts on community support fortourism in Harapan Island, Kepulauan Seribu. Data were collected using a questionnaire. The population wasthe people of Harapan Island. Around 100 residents were selected as respondents through accidental sampling.Then, data were processed using PLS-SEM version 3.2.8. Based on the hypothesis test, economic and socioculturalfactors significantly influence community support. Socio-cultural factors have the most significanteffect on community support. Meanwhile, environmental factors do not affect community support. The researchcontributes to the model of community support for the development of tourism on a small island. To increasecommunity support, it is necessary to increase the income of the community, job opportunities, security, protectionof traditional culture, and welfare.