Responding to the growing diversity of students within North American schools today, educators have recognized the value of social inclusion as an important goal, supporting both social-emotional and academic success for all students. This special issue explores how teachers play a significant role in promoting inclusive classes by understanding the social dynamics that operate in educational contexts. Addressing a number of different forms that diversity can take (gender, ethnicity, physical and/or mental exceptionalities), these articles rightfully focus attention on group processes that promote inclusion versus exclusion and their impact, and underscore the need for teacher training in such efforts. Supporting and extending this discussion, we present an overview of recent efforts to promote "universal design for learning" in education, which focuses on academic as well as social inclusion, in hopes that educators consider even broader approaches to celebrating diversity and teaching students to relate to others with acceptance and respect.