This study examined the association between peer-reported bullying-related behaviours (bully, victim, outsider and defender), age, gender, autism severity and teacher-rated emotional and behavioural problems in adolescents with autism spectrum disorder, using a multi-informant approach. The sample comprised 120 adolescents (11% girls, M[subscript age] = 15.6 years, standard deviation = 1.89 years) attending a special school for children with autism. Results show that bullying decreased with age and was associated with behavioural problems, while victimisation was only associated with peer problems--a pattern of results comparable to studies exploring these associations in typically developing children. However, there were few associations among study variables for outsider or defender behaviours in this sample. Notably, children's autism severity did not significantly predict bullying-related behaviours.