The purpose of this article is to introduce the Early Childhood Longitudinal Study-Kindergarten (ECLS-K) database to school social work practitioners and researchers. This database not only serves as a viable source for evidence-based practice pertaining to the influences of families and schools on the academic achievement of children beginning at school entry but also provides longitudinal capacities to analyze long-term impacts throughout children's primary education. The article provides an overview of the ECLS-K study, a discussion about use of the database and training opportunities, a brief presentation of select database variables relevant to school social work, and a discussion of the benefits of the ECLS-K as a source for secondary data analysis. The article concludes with applications for school social work practitioners.