This evaluation of the KIPP school leadership programs, funded by a grant from the Supporting Effective Educator Development program in the Office of Innovation and Improvement at the U.S. Department of Education, aims to support sustained implementation of effective programs to prepare and support school leaders. KIPP administers three school leadership programs examined in this evaluation: (1) the Successor Prep program, which prepares new principals to lead existing schools; (2) the Fisher Fellowship program, which prepares new principals to lead new KIPP schools; and (3) the KIPP Leadership Design Fellowship (KLDF) program, which disseminates effective school leadership development strategies outside of KIPP. In addition to supporting KIPP to improve the design of the KIPP school leadership programs, the evaluation findings can guide the replication of effective tools and strategies that increase the number of highly effective principals among other charter and traditional public schools as well as across the principal preparation field. To understand how KIPP school leadership programs support the development of effective school leaders, this evaluation (1) conducted a descriptive analysis of results from surveys that we designed and administered to former program participants, (2) compared outcomes for teachers and students in schools that received Successor Prep principals to those for other similar KIPP schools in a comparison group, and (3) examined properties of the instrument KIPP uses to select participants for the Fisher Fellowship program, including its reliability.