This report explores evidence to identify the potential benefits and to inform the implementation of dementia specialist nursing roles to support people with dementia during admission to hospital. It shows a business case exists for developing a dementia specialist nurse role in the United Kingdom. The evidence suggests that a properly trained and educated dementia specialist nurse, undertaking a clearly defined role, and working directly with people with dementia and their carers for a significant proportion of the time, could benefit people with dementia in hospitals. If these benefits addressed only a fraction of the excess stays experienced by people with dementia, a significant return on investment could be obtained. A reduction in hospital stay by one day on average could achieve an annual return on investment of 37%, with a net saving of nearly £11,000,000 nationally.