This chapter serves as an introduction to building a comprehensive school counseling program (CSCP). In a CSCP, school counselors serve as collaborative leaders advocating for systemic change using data and incorporating an equity lens with every decision made. CSCPs are developed, delivered, and maintained to promote student success in academic, career, and social/emotional domains. Examples of how varying school districts throughout the United States approach school counseling programs are included. This chapter also provides guidance for school counselors through the process of developing a CSCP. Scholarly support for the benefits of a CSCP are presented, and practical application of the model, including the benefits of a CSCP for multiple stakeholders, are discussed.