This paper presents social justice principles as core concepts in school psychology practice via a conceptual framework that combines theory, research, training, and practical applications. Focusing on the specific needs of Greece (i.e. economic recession, influx of migrant and refugee students, etc.), we discuss the inclusion of multicultural and international components of school psychology practice as well as implications for socially just practice. Specific examples of interventions and activities developed and implemented by the Laboratory of School Psychology of the National and Kapodistrian University of Athens, which emphasizes the application of social justice principles to practice, are also presented. Finally, we discuss specific guidelines for developing interventions that embrace social justice principles globally as well as explore transnational implications.