This Funding Opportunity Announcement (FOA) solicits mechanism-focused dementia care and caregiver support intervention development research at Stages I through V of the NIH Stage Model to address the care needs and promote the health, function, and well-being of persons with Alzheimer’s disease (AD) and Alzheimer’s disease-related dementias (ADRD) and of those providing their care. The NIH Stage Model offers a framework to: (1) support development of efficacious interventions that are defined by their principles; and (2) ensure that these efficacious interventions can be administered in the community or in health systems with fidelity to the intervention’s principles. This includes the development, testing, and validation of scalable training materials and procedures so that these interventions can be delivered with fidelity in community settings or health systems. Settings can include the home, community, or formal care settings, such as nursing homes, assisted living facilities, nursing and rehabilitation centers, hospitals, adult day care, and specialized hospice settings. The overarching purpose of this FOA is to help to lay the groundwork for real-world implementation of AD/ADRD care and caregiving interventions.