The goal of the current paper is to provide a critical analysis of barriers to social inclusion in schools and propose inclusive educational practices that help connect and unite diverse students. Diversity is defined broadly as overall heterogeneity. We review theoretical frameworks that help explain group dynamics and contextual conditions that contribute to exclusion (i.e., peer victimization, rejection, friendlessness) of students based on ethnicity, sexual orientation, body weight, etc. We argue that to be able to facilitate peer acceptance and cross-group friendships, educators need to be aware of group and interpersonal dynamics, and how some common school practices highlight differences and segregate students in ways that further promote divisions. We propose proactive practices as “built-in” preventions to increase social inclusion, in addition to summarizing relevant intervention approaches. To conclude, we recommend greater emphasis on social inclusion in teacher education and professional development as well as provide suggestions for future research.