Yearly data are collected describing progress in inclusive education. Frequently used criteria are the percentages of students attending special schooling or percentages of students officially labelled as having special educational needs (SEN). However, both criteria have pitfalls. In this study, the social participation of students was used as a criterion. We compared the social participation of students with SEN to the social participation of typically developing students in three countries, i.e. Norway, the Netherlands and the Flemish region of Belgium. In Norway, 37 seventh-grade students with SEN and 461 classmates; in the Netherlands, 29 seventh-grade students with SEN and 187 classmates; and in Flanders, 43 seventh-grade students with SEN and 469 classmates participated in this study. Peer nominations were used to assess students' peer acceptance in class. Results indicated that, across education systems, students with SEN had more social difficulties compared to typically developing students. Contrary to our initial expectations, the social participation of students with SEN in the more inclusive Norwegian education system did not outperform the social participation of the Dutch and Belgian students with SEN. However, these outcomes are an artefact of the sampling methods used. This confirms the complexity of international comparisons.