This report focuses on the “Build the Case” step of the Ontario Trillium Foundation’s process step, and will dive deeper into the models of, and roles for, Dementia-Friendly Communities and Collective Impact in responding to the unique needs of people living with dementia and their care partners. [...] Using a collective impact approach, and the Dementia-Friendly Communities model, funded by and in partnership with the Ontario Trillium Foundation (OTF), the Alzheimer Society of Ontario proposes to champion a multi-sector collaborative movement focused on improving the quality of life for people living with dementia and their care partners. [...] It marks a fundamental shift from a focus of meeting the physical and health needs of people living with dementia to a holistic approach to supporting the person to achieve the best quality of life reasonably possible27. [...] Dementia-friendly communities focus on inclusion and coming together of communities to challenge the current status quo, often characterized by the exclusions and marginalization of people living with dementia, and the reinforcement of social isolation and ongoing inequalities28. [...] To achieve success with dementia-friendly communities will require a change in attitudes and culture of the kind that people with disabilities and their advocates have fought for over many decades, and are founded in the convention on the rights of people with disabilities.