With the needs and challenges of adolescent homelessness on the rise, the McKinney-Vento Homeless Assistance Act (MVA) was crafted as a public policy initiative aimed at facilitating access to schools for this population. While school social workers are the designated personnel for practice with homeless school-aged children, we know little about their abilities to implement the MVA or what hinders or facilitates their practice with this population. In this qualitative study of 201 school social workers, barriers to school social work practice with homeless children are explored. The most common barriers cited by the participants revolved around parental issues and support. We determined that the role that parents of homeless students play might be paramount to the success of MVA implementation. However, future research should investigate that relationship in greater detail. Implications for practice and future research are discussed. (Contains 3 tables.)