While social justice advocacy likely has been present in school psychology throughout its history, the last few years have seen a marked increase in the prominence of social justice language and ideas within the National Association of School Psychologists. Existing research suggests that applying social justice principles requires both professional knowledge (e.g., knowledge of best practices) and a personal commitment to action (Jenkins et al., 2018; Jones et al., in press). There is great variation in people's capacities to engage in bringing social justice principles into practice. Quantitative measures of one's attitudes and behaviors as they relate to social justice can be an important component of tracking the field's progress toward bringing the potential of social justice into professional reality. This brief article reviews four existing instruments that measure one's social justice attitudes and provides recommendations based on the findings.