This research aimed to describe and analyze: 1) the effect of the academic supervision toward teacher performance, 2) the effect of the participation of Teacher Working Groups toward teacher performance, and 3) the effect of the academic supervision, and the participation of Teacher Working Groups simultaneously toward teacher performance teacher performance of Catholic education in North Sulawesi. Survey method was implemented with qualitative approach. Population unit were 144 teachers. Research sample were 59 teachers which randomly selected from 144. Questionnaire with Likert scale was the technique used to collect the data. Testing the hypothesis were using simple and multiple correlation analysis. The result of data analysis showed that: 1) there was effect of the academic supervision toward teacher performance, 2) there was effect of of the participation of Teacher Working Groups toward teacher performance, and 3) there was effect of the academic supervision, and the participation of Teacher Working Groups toward teacher performance teacher performance of Catholic education in North Sulawesi. Based on these conclusion, it could be recommended that: 1) for Catholic religious education teachers, to involve themselves in the activities of teacher working groups so that they can improve teacher performance, 2) for the principal, to be active and more optimal in carrying out supervision, 3) for BIMAS Catholic North Sulawesi, so that the principal's quality improvement program is added to Catholic religious education teachers and facilitates supervision activities from the principal. Keywords: Academic Supervision, Participation of Teacher Working Groups, Teacher Performance. DOI : 10.7176/JEP/10-15-01 Publication date :May 31 st 2019