Achievement Goal Theory (AGT) is one of the most popular theoretical frameworks in motivation research. Despite its application to a variety of contexts, including, school, work, and sport, it has not yet been referenced in the field of school psychology. First, we review the theoretical underpinnings as told through the theory's evolving models, explore its impacts on cognition, emotion, and behavior, and introduce a multiple goals perspective. Second, we outline the leading research supporting AGT, both in terms of structural and individual intervention studies. Third, we apply the principles of AGT to the primary tasks of school psychology professionals, including assessment, intervention, and consultation practices. The students we support can greatly benefit from gearing our approaches toward ones that foster self-improvement and interest.