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Introduction: The effect of platelet transfusion (PT) has been studied in patients with intracerebral hemorrhage, but has not been reported for aneurysmal subarachnoid hemorrhage (aSAH). We investigated the effect of PT on the outcome of patients with aSAH.Methods: We retrospectively evaluated 84 patients admitted with aSAH to a Comprehensive Stroke Center in the United States between 2011 and 2015. Charts were reviewed for variables including length of hospitalization, 3-month modified Rankin Scale (mRS), and complications related to endovascular treatment of cerebral aneurysm. Intergroup differences were evaluated with the Chi-squared and Student’s t-test. mRS was evaluated using multivariate ordinal logistic regression. Variables with a univariate p-value <0.2 association with 3 month mRS were included in the ordinal logistic regression model.Results: Patient demographics and clinical variables are seen in Table 1. 30% of patients received PT. PT was associated with male gender, Hunt-Hess score, Fisher Score, external ventricular drain placement, and longer hospital length of stay. After multivariate ordinal regression, PT was associated with higher mRS and there was a trend for association with Hunt-Hess score (Table 2).Conclusion: Our findings suggest that platelet transfusion is common in patients presenting with aSAH. Platelet transfusion in these patients is associated with longer hospital stay and a significantly lower rate of good clinical outcome, with a nearly 4- to 6-fold higher odds of a one-point increase in mRS at 3 months. The association of platelet transfusion to worse outcome in patients with aSAH warrants further study.