This review integrates theoretical perspectives and empirical evidence of a sense of school belonging (SOSB) to highlight its importance in understanding the inclusion efficacy research for pupils with special educational needs (SEN). Specifically, it examines the role of a SOSB on pupils' cognitive, affective, behavioural and social developmental outcomes. In addition, it considers the inclusion efficacy research regarding the outcome of mainstream and special education for pupils with SEN. In turn, the review synthesises the two areas of research on school belongingness and inclusion to suggest that a SOSB is important in understanding the relationship between school placement and developmental outcomes for pupils with SEN. (Contains 1 note.)