The study determined the Level of Implementation of the Barangay Justice System and community satisfaction in the Municipality of Calauan. Through this objective, the study helped create an intervention program that will surely help in decongesting the court dockets and improve the mediation process in the Municipality of Calauan. This study was descriptive correlational that dealt with the relationship of relevant variables, particularly the Implementation of Barangay Justice and Community Satisfaction. It assessed the relationship between variables and a quantitative research design that used a self-made questionnaire which was answered by 255 respondents, specifically 10 members in the Lupon Tagapamayapa and 5 clients who filed a case in the Katarungang Pambarangay in all 17 Barangays of the Municipality. It collected quantifiable information and used a statistical test to analyze the data. Based on the findings of the study, the results made by the Lupon Tagapamayapa Members and its Constituents on the Implementation of the Barangay Justice System were all fully implemented. On the test of significant difference between the assessment of Lupon Tagapamayapa Members and its Constituents as regards the Implementation of Barangay Justice System were all greater than the level of significance at .05 concluded that there was no significant difference in the assessment of the respondents on the Level of Implementation of Barangay Justice System in the Municipality of Calauan, Laguna. An output was made after determining the least mean results in the study. A comprehensive Intervention Program that will help the Municipality of Calauan in Implementing the Barangay Justice System.