Emerging evidence suggests that adolescent girls with Attention-Deficit/Hyperactivity Disorder (ADHD) are more socially impaired compared with their peers; however, research has yet to elucidate the nature of this impairment. We investigated overt (e.g., physical, such as hitting or kicking or verbal, such as teasing and taunting) and relational (e.g., social manipulation, such as social exclusion) bullying and victimisation in adolescent girls with and without ADHD. Adolescent girls (mean age = 15.11) with (n = 22) and without (n = 20) ADHD and their primary caregivers completed measures of overt/relational bullying and victimisation and social impairment. Adolescent girls with ADHD experienced more social problems and more relational and overt victimisation than adolescent girls without ADHD. Although adolescent girls with ADHD engaged in more overt and relational bullying than adolescent girls without ADHD, this difference was not statistically significant. Oppositional Defiant Disorder symptoms appeared to be more strongly related to bullying behaviour, while victimisation appeared to be more strongly related to ADHD.