Hidradenitis suppurativa (HS) disproportionately affects women of childbearing age. However, pregnancy and maternal outcomes for women with HS are unknown. To compare risk of adverse pregnancy and maternal outcomes among women with and without HS, and to evaluate influence of comorbid conditions. Retrospective cohort analysis between January 1, 2011 and September 30, 2015.Compared to control pregnancies (n=64,218), HS pregnancies (n=1,862) had higher risk of spontaneous abortion (15.5% vs 11.3%), preterm birth (9.1% vs 6.7%), gestational diabetes mellitus (11.6% vs 8.4%), gestational hypertension (6.1% vs 4.4%), preeclampsia (6.6% vs 3.8%), and cesarean section (32.4% vs 27.1%). Relative risk of some pregnancy and maternal outcomes were attenuated after comorbidity adjustment. In the fully adjusted model, HS pregnancies were independently associated with spontaneous abortion [OR 1.20; 95% CI 1.04-1.38], gestational diabetes mellitus [OR 1.26; 95% CI 1.07-1.48], and cesarean section [OR 1.09; 95% CI 1.004-1.17].