This multimethod study provides detailed information about the friendships of 87 children (76% boys) with ADHD and 46 comparison children aged 7–13 years. The methods included parent and teacher ratings, self-report measures and direct observation of friends’ dyadic behaviors in three structured analogue tasks. Results indicated that, in contrast with comparison children, children with ADHD had friends with high levels of ADHD and oppositional symptoms; they perceived fewer positive features and more negative features, and were less satisfied in their friendships. Observational data indicated that children with ADHD performed both more legal and more illegal maneuvers than comparison children in a fast-paced competitive game. While negotiating with their friends, children with ADHD made more insensitive and self-centered proposals than comparison children. In dyads consisting of one child with ADHD and one typically developing child, children with ADHD were often more dominant than their friends.