The purpose of this study was to develop a measurement instrument that scholars and practitioners in international education can use as a means of exploring whether and how individuals who come into contact with international education programs develop a greater sense of cultural humility. Specifically, the study described here outlines the four steps used to develop a nine-item Cultural Humility Self-Assessment Scale (CHS-A): item generation, content validity, item reduction, and scale reliability and validity. These efforts resulted in a valid and reliable instrument that individuals who work in international education can use to evaluate and improve programs and initiatives.