The majority of children with ASC are educated within a mainstream secondary setting. The challenges within the new environment may lead to some children experiencing a breakdown in provision resulting in temporary or permanent exclusions. A gap in the literature highlights a need for research which seeks to understand the views and experiences of year 7 children with ASCs about theirtransition to mainstream secondary school. The research involved four year 7 children with ASC, from across three settings, who had recently transitioned from a mainstream primary school to a mainstream secondary school (without resource based provision). The views of their parents and teachers were also sought. A multiple-embedded case study design was employed involving four cases from across three school settings. This involved utilising a transition Q-sort and a semi-structured interview with four children and semi-structured interviews with six parents and three teachers. The data was analysed using content analysis and thematic analysis (Braun & Clarke, 2006). The findings highlight a need for individualised transition planning for the child with ASC; consideration of co-occurring difficulties and the importance of including the views of the child and parents in transition planning. The findings are discussed in relation to psychological theories and existing literature. The implications for future research, local authority policy, school staff, parents and educational psychologists are considered.