Psychologists who work in the schools have an ethical and professional responsibility to become informed about the knowledge base that addresses the delivery of psychological services to children from diverse backgrounds. This article reflects (1) a synthesis of some of the existing knowledge base about how best to promote the educational and psychological well-being of diverse students and their families within the school context, and (2) recommendations for practices for psychologists working in the schools. These recommendations for practice are intended to address professional issues which, if neglected in service delivery to racially, ethnically, culturally, and linguistically diverse populations, can lead to inappropriate referrals for services, misassessments of needs and issues, ineffective interventions and therapeutic approaches, and erroneous research results. Specific professional practices are identified and illustrations of those practices are provided to help guide psychologists' behavior and actions when delivering services to a diverse clientele in the schools.