This article addresses the impact of high school social workers on the graduation rates of incoming freshmen. Following a review of the limited literature on school social workers and student outcomes, it presents results of a study on the relation between school social workers and graduation rates in the one hundred largest school districts in the United States. Findings of this study indicate that the number of school social workers is positively associated with graduation rates in the 2008-09 academic year after controlling for poverty rate and district size. From this finding, the article raises questions that may guide future research regarding the role of school social workers in achieving positive student outcomes.