Using qualitative and quantitative methods, this study was designed to establish a model of the Catholicity of Catholic Basic schools in Davao Provinces, Philippines. The outputs of focus group discussions were analysed and used to construct the framework of the study and the basis for the survey instrument. The data gathered were subjected to Exploratory Factor Analysis (EFA) which produced four factors on Catholicity and seven factors for External Factors. The identified factors were loaded into the proposed model and analyzed using Structural Equation Model (SEM). The findings revealed a significant influence of the External Factors to Catholicity affirming the study’s theoretical foundation. All seven observed variables showed positive contribution to External Factors(Latent Variable). Moreover, the findings showed significant contributions of the four observed variables to Catholicity (Latent Variable). Thus, the model measures Catholicity looking at the four observed variables and is further influenced by External Factors measured in terms of the seven observed variables. Based on the SEM findings which were supported by related literature and studies, the model of the Catholicity of Catholic Basic Education Schools in Davao Provinces will help schools remain faithful to their identity and mission as Catholic institutions. Keywords - Basic Education Catholic Culture, Catholicity, Structural Equation Mode, Digos City, Philippines