This study explored the mediating effect of community-based tourism implementation on the relationship between community participation and the socio-economic sustainability of tourism in Marilog District. This study employed a quantitative method and stratified random sampling to select the 380 respondents. The survey was distributed to two areas in Marilog District: Barangay Baganihan and Barangay Datu Salumay. The data was evaluated to ascertain whether the variables had a statistical relationship. This study used non-experimental quantitative research, the descriptive-correlation approach, and mediation analysis. The weighted mean, Pearson product-moment correlation coefficient, multiple regression analysis, and path analysis were used to analyze the data. The result revealed that the respondents have high levels of community participation, socio-economic sustainability, and community-based tourism implementation. The relationship between community participation and socio-economic sustainability, community participation and community-based tourism implementation, and socio-economic sustainability and community-based tourism implementation were statistically significant. However, the indirect effect of community participation in socio-economic sustainability through community-based tourism implementation is insignificant and statistically supported by this study, indicating no significant mediation. The study findings’ implications are presented.