Chronic pain and its consequences are major global health challenges, and the prevalence is increasing worldwide among adolescents. Adolescents spend most of their waking hours in school; however, there is limited research available on how school nurses can address chronic pain among adolescents in the Swedish school context. Therefore, we designed a person-centred intervention, known as Help Overcoming Pain Early (HOPE), to enable school nurses to offer adolescents strategies to manage their stress and pain. We used the Medical Research Council (MRC) framework for developing and designing this new complex intervention. For this study, we describe two of the four phases: (a) development and (b) feasibility and piloting. The final version of the HOPE programme consists of (i) an educational package for school nurses in the areas person-centred care, stress and pain education/management and gender perspective; and (ii) an intervention package for adolescents with chronic pain. The programme consists of four sessions during which adolescents with chronic pain have person-centred dialogues with a school nurse. The HOPE programme is based on the existing evidence of managing chronic pain and on the assumption that school nurses can support adolescents with chronic pain by using person-centred care.