Teacher leadership has emerged as a pivotal construct for advancing instructional quality and sustainable school improvement, yet the cumulative evidence on its outcomes remains fragmented across varied methodologies and theoretical anchorings. This study maps and synthesizes the outcomes of teacher leadership by combining a systematic literature review (SLR) with bibliometric analysis. Following the PRISMA protocol, 78 peer-reviewed articles published between 2013 and 2023 were retrieved from ScienceDirect, Springer, Emerald, ERIC, and ProQuest, and analyzed using Publish or Perish, Mendeley, VOSviewer, and Microsoft Excel. Five interrelated outcome domains emerged: professional learning communities (PLCs), student learning, effective instructional practice, organizational learning, and teacher self-efficacy and job satisfaction. Teacher leadership exerts its most consistent effects on student learning, realized through effective instructional practice and mediated by PLCs and organizational learning, with principal leadership functioning as a structural enabling condition. The study contributes an integrated conceptual model linking teacher leadership to sustainable school improvement via two mediating pathways, including PLCs and organizational learning, and identifies the absence of structured, principal-led teacher leadership development programs as a critical research gap warranting urgent empirical attention
Publication Date: 2026-06-19