This study investigated the influence of supervision of actual teaching activities on teacher's competence in primary schools in Kanungu District, South Western Uganda. To achieve the purpose of the study, three null hypotheses were formulated. Cross – sectional research design was used for the study. Purposive sampling was used to identify head teachers and SMC, while simple random sampling was used to select teachers and student leaders. Content validity of the instruments was established by subjecting the instruments to the scrutiny of research experts and the instruments refined at their recommendations. Questionnaires further subjected to rating and Content Validity Index (CVI) of 0.974 and 0.939 obtained for the teachers’ and students’ questionnaires respectively. To determine reliability of the instruments, Cronboch’s alpha reliability coefficient was computed for each set of questionnaires using SPSS program (Version 20) and Cronboch’s alpha value of 0.956 and 0.865 obtained respectively, confirming that the instruments were reliable in achieving the objectives of the study. Data collection was carried out using interviews and questionnaire survey. Descriptive statistical Analysis with frequencies and percentages was used to analyze quantitative data and Pearson Product Moment Correlation co-efficient (r) was used to establish the direction and strength of relationship between supervision and teacher's competence at 0.05 level of significance. Results obtained revealed that supervision of actual teaching activities has a significant positive relationship with teacher's competence; also, supervision of actual teaching activities has a significant positive influence on teacher's competence in schools. The study concluded that supervision of actual teaching activities has a high positive influence on teacher's competence in primary schools. The study recommended that regular class supervision by head teachers and prompt feedback to the teachers and regular workshops and seminars by Ministry of Education and Sports to equip head teachers with skills for effective supervision that will lead to better competence.