Hypertension is a major risk factor for cardiovascular disease, which is the leading cause of mortality in women in developed countries. This pooled analysis assessed the antihypertensive efficacy, safety and tolerability of monotherapy with the direct renin inhibitor aliskiren (150 mg and 300 mg) over 8-12 weeks in women with mild-to-moderate hypertension (mean sitting diastolic blood pressure (msDBP) ≥95 and <110 mm Hg) across eight randomized and double-blind trials. Safety and tolerability were assessed in the five placebo-controlled trials in the analysis. In the 1527 women enrolled in these studies, aliskiren 150 mg and 300 mg produced significantly greater blood pressure (BP) reductions (14.1/11.0 and 16.1/12.3 mm Hg, respectively) compared with placebo (7.2/7.6 mm Hg; P<0.0001). BP reductions with aliskiren monotherapy in women were similar to those observed in men, and consistent across subgroups of age, metabolic syndrome and obesity. The overall incidence of adverse events in women was similar with aliskiren treatment (150 mg, 42.3%; 300 mg, 46.0%) and placebo (39.0%); adverse events with aliskiren were more frequent in women than in men, consistent with previous studies of gender differences in drug tolerability. In conclusion, aliskiren monotherapy at 150 mg and 300 mg doses provided effective, dose-dependent BP-lowering in women with mild-to-moderate hypertension, and it was well tolerated.