Full-service community schools aim to reduce educational inequality by addressing the multifaceted needs of low-income children and youth. Critical to this task is the ability of these schools to generate sufficient social capital to provide students, families, and teachers with essential resources. Using data from a qualitative case study, this article explores how social capital was manifested in an urban full-service community elementary school. Findings show that the principal, teachers, and staff were important sources of school-based social capital, which enabled the provision of services to students and families. However, resource scarcity and interethnic tensions threatened the expansion of social capital and the school's transformative potential. We discuss implications of these findings for the theory, research, and practice of full-service community schools.