Background: Despite having higher levels of mental health difficulties than the general population, limited research exists about how individuals with intellectual disabilities view mental health. Providing education about mental health literacy can contribute to maintaining positive mental health. Individuals who understand positive mental health are more likely to take steps to improve their mental health. Aims: This study explores how young adults with intellectual disabilities conceptualise and define the concept of positive mental health. Materials & Methods: Eight participants were interviewed using phenomenographic methods. Results: Using phenomenography as the approach, four categories of description emerged from the analysis and included defining positive mental health as related to physical health, lack of clarity about positive mental health, positive qualities (emotions and actions) and mental health components. Discussion: This study highlights the need for further research, exploring how to provide support through psychoeducation to individuals with intellectual disabilities about mental health.