Collective teacher efficacy is a social construct in schools defined as teachers’ sense of group effectiveness. This is a powerful construct whereby teachers’ perceptions are a driving force for school culture and student achievement. This cross-sectional study used a quantitative approach to examine teachers’ collective efficacy as it relates to their perceptions of supervisory practices. Correlational and predictive analyses were performed to analyze the degree of the relationship between collective efficacy and supervisory practices. Additionally, this study examined teachers’ perceptions of strong instructional leadership as it relates to the instructional leadership strategies used by supervisors in 14 schools in one school district. The purpose of this study was to make clear statements for school leaders in regard to the strategies that are associated with teachers’ perceptions of collective efficacy and teachers’ perceptions of strong instructional leadership. The strategies studied for this report were using walkthroughs, using the clinical supervisory model, maintaining professional learning communities, and creating an overall environment to support teachers.