Background: Individuals with severe or profound intellectual disabilities can face difficulties in getting mental health support, and little is known about psychological therapies for this population. Mothers' experiences and perspectives in seeking support and adapting therapies were explored. Method: Semi-structured interviews were conducted with six mothers of adults with severe or profound intellectual disabilities, who had sought mental health support for their offspring. Interviews were audio-recorded, and analysed using Interpretative Phenomenological Analysis. Results: Mothers found it difficult to recognise signs of emotional difficulties in their offspring. Individuals faced barriers to receiving adequate support, with professionals thought to lack the knowledge to work with people with severe impairments, resulting in individuals facing discrimination. The importance of the therapeutic relationship and involving carers in therapy were considered. Conclusion: This study highlights the need for more appropriate mental health support for these individuals. Future research could trial adapted psychological therapies with this population.