Katarungang Pambarangay is the process to keep the community intact and to improve access to justice for the poor. This study purported to analyse the effectiveness of the Katarungang Pambarangay in Old Zaniga and Barangka Ilaya of Mandaluyong City in the disposition of cases that were filed from 2015 to 2016. The respondents of the study were the 20 Lupon tagapamayapa and secretaries of the offices of barangays Barangka Ilaya and Old Zaniga of Mandaluyong City. The approaches include qualitative analysis of data generated from documents particularly the Lupon Tagapamayapa report on case filed, actions taken and problems encountered in the implementation of Katarungang Pambarangay Judicial Service System (KPJSS), a focus group discussion (FGD) was conducted among Baranggay Captain and Lupon members in Barangka Ilaya and Old Zaniga and the data collected was evaluated using percentage and weighted mean. It also used a 5-point Likert scale to determine the extent of effectiveness of the implementation of KPJSS in terms of the nature of cases in Barangay Barangka Ilaya for 2015 to 2016. The findings of the study revealed, it is encourage continuing intensified information dissemination on the basics of the Law on dispute settlements to arouse peoples’ consciousness on the intentions, objectives of the law – triggering and motivating them to realize its importance and render civic duty. Moreover, The Local Government should provide an in service – training among Lupon members to be more effective in handling disputes among the complainants in Mandaluyong City. Finally, the Department of Interior and Local Government should look into the improvement of dispute settlements and the updating of existing system’s policies of Local Government Code of 1991 in providing a more effective and efficient in delivering speedier and quality justice through non- adversarial for the security and welfare of the community.