The Smithsonian Science Education Center in partnership with Shell Oil Company convened a group of leading education organizations in Washington, D.C. on September 19-20, 2016, to share and discuss proven strategies that have improved the recruitment, retention and promotion of a diverse STEM teaching workforce. Specifically, the meeting was designed to address the following goals related to increasing the diversity of the STEM teaching workforce: (1) developing a playbook for school district-level systems change; (2) implementing school district-level systems change; and (3) advancing leadership development. This publication ("The Playbook") addresses the first goal of the convening: Developing a playbook for district-level systems change. This Playbook captures some of the best practices for creating systems level change at the district level that have proven successful in increasing the recruitment, retention and promotion of a diverse STEM teaching workforce. The text is augmented with several district-level case studies for additional details on the identified strategies.