Background: Dementia research prioritisation allows for the systematic allocation of investment in dementia research by governments, funding agencies and the private sector. There is currently a lack of information available in Ireland regarding priority areas for dementia research. To address this gap, a dementia research prioritisation exercise was undertaken, consisting of an online survey of professionals in the dementia field and workshops for people living with dementia and family carers. Methods: (1) An anonymous online survey of professionals, based on an existing WHO global survey: The global survey was adapted to an Irish context and participants were asked to score 65 thematic research avenues under 5 criteria; (2) A mixed-methods exercise for people living with dementia and family carers: This involved two facilitated workshops where participants voted on the research themes they felt were important to them and should be addressed through research. Results: Eight of the top ten research priorities in the survey of professionals (n=108) were focused on the delivery and quality of care and services for people with dementia and carers. Other research avenues ranked in the top ten focused on themes of timely and accurate diagnosis of dementia in primary health-care practices and diversifying therapeutic approaches in clinical trials. Participants in the workshops (n=13) ranked ‘better drugs and treatment for people with dementia’, ‘dementia prevention/ risk reduction’ and ‘care for people with dementia and carers’ as their top priority areas. Conclusions: Findings from this prioritisation exercise will inform and motivate policymakers, funders, and researchers to support and conduct research to address the burden of dementia and ensure that the limited resources made available are spent on research that has the most impact for those who will benefit from and use the results of research.