Purpose: Neurodevelopmental difficulties are correlated with lower mental well-being and more mental health problems. Issues in social relations such as bullying are a prominent risk factor in a social setting of high school, have also been associated with the status of disability. This thesis investigated the relation between mental health problems, mental well-being, and bullying in adolescents with self-reported neurodevelopmental difficulties and compared these with adolescents with Other disabilities. Materials and methods: Data from a Swedish longitudinal survey study (LoRDIA) was used. Mental health problems were measured through emotional and conduct problems scales of SDQ, mental well-being was measured with MHC-SF, and a bullying questionnaire was used. Results: Adolescents with NDD experience more bullying victimization and perpetration than adolescents with Other disabilities such as physical disability and autoimmune diseases. Significant association to bullying perpetration was found in NDD adolescents. Adolescents with Other disabilities indicated high mental well-being compared to NDD. While gender predicts high mental well-being, disability and emotional problems have a negative relation with it. Conclusion: Adolescents with NDD report more bullying victimization and perpetration experiences in comparison to adolescents with Other disabilities. Emotional problems have an inverse relation for predicting high mental well-being for adolescents with NDD and Other disabilities.