People with intellectual and developmental disabilities (IDD) experience elevated risk for poor health and social outcomes in adulthood and are at risk for experiencing homelessness and housing instability. Although the exact prevalence of IDD among homeless populations is unknown, a small body of literature related to the intersection of IDD and homelessness suggests differential health needs and service use patterns, with a need for targeted health and social services. In this study, we explore the perceptions and experiences of 18 homeless or disability service providers about (a) their clients at the intersection of IDD and homelessness and (b) their role and the services provided at the intersection of IDD and homelessness. Participants struggled to provide appropriate, accessible services for this population, owing to lack of training and awareness of specific needs, fragmented systems, and inadequately funded healthcare and housing support. Our findings also reveal that clients at this intersection have high contact with public systems, which places them at risk for losing their right to self-determination. Recommendations center on systems transformation to facilitate the ability of providers to collaborate and to make data-driven decisions to deliver person-centered care.