This quantitative-descriptive-correlational research sought to determine the level of performance of Lupon Members under the Barangay Justice System as perceived by the constituents of selected barangays in the Municipality of Badiangan, Iloilo, in terms of Knowledge, Systematic Procedures, Decision Making, and Interpersonal Skills. A total of 128 constituents participated in the study. They were complainants and respondents of complaints filed in the barangays. The study found out that the respondents’ perceived level of performance of their Lupon Members was “Outstanding” in all categories, which means that they were efficient and effective in performing their duties and roles. It also found out that there was no significant difference in the respondents’ perception of the level of performance among Lupon members when categorized according to sex, age, civil status, educational attainment and occupation. The findings confirm the effective implementation of the Barangay Justice System which helps in reducing backlog cases in actual courts.