Attention deficit hyperactivity disorder (ADHD) is a condition diagnosed in 5% of children and adolescents. This neurodevelopmental condition causes impaired academic, social, and occupational functioning. Adolescents with ADHD symptoms have lower health-related quality of life and children with ADHD have been described as having difficulties forming positive friendships. Therefore, the aim was to describe how 15–17-year-old adolescents with ADHD experience friendship with peers. A semi-structured interview study was conducted with twelve adolescents about their experiences of friendships. The adolescents were recruited from a Swedish psychiatry clinic. A qualitative content analysis was used. In the results, three main categories were constructed: "Bonding with Friends" underscores the importance of understanding, shared interests, and adaptability. The "One’s own role" category emphasises the dynamic interplay of self-perception and interpersonal behaviours in interaction with friends. The "How Friendship Matters" category describes the complex nature of friendships, involving both support and conflicts. The adolescents’ relationships improved with age, influenced by self-awareness, ADHD medication and support from adults. In conclusion, friendships play a crucial role in the well-being of the participants, providing vital support when navigating ADHD associated challenges. It is essential that the adolescents themselves, but also adults and healthcare providers, recognise and address their impulsivity issues and need for daily planning. We should assist adolescents in developing effective interaction strategies with friends. The study highlights the significance of friendships and peer support for the adolescents’ health and functioning.