Thesis advisor: Joseph O'Keefe / Effective instructional leadership is central to principal practice. Thus, the Massachusetts Model System for Educator Evaluation (MMSEE) mandates that all principals demonstrate proficiency in instructional leadership to be considered proficient overall. Given this mandate, it is imperative that central office administrators (COAs) support principals in this regard. Accordingly, this qualitative single case study examined how COAs in one Massachusetts district supported principals’ instructional leadership. Analyses of documents and semi-structured interview data found that COAs supported principals’ instructional leadership through professional development for supervising and evaluating teachers, preparation of school improvement plans, and increased staffing of assistant principals and academic coaches. However, principals reported interim feedback and summative evaluations as not supporting their growth as instructional leaders. To address this gap in support with instructional leadership, recommendations included assigning additional COAs to evaluate principals for consistent and targeted feedback, reviewing MMSEE performance expectations with principals, and including principal voice in the district decision-making process. / Thesis (EdD) — Boston College, 2016. / Submitted to: Boston College. Lynch School of Education. / Discipline: Educational Leadership and Higher Education.