Objectives: The Foley balloon catheter (FC) is a viable method for cervical ripening, but concerns about infection risk restrict its use in cases of prolonged prelabour rupture of membranes (PROM). This study aims to evaluate the efficacy and safety of the FC compared to oral misoprostol for cervical ripening after PROM. Study Design: A retrospective data-analysis of 128 pregnant women was conducted. Of these, 49 underwent cervical ripening with an FC and 79 with oral misoprostol. We included all women with a vital singleton pregnancy at 37 -42 weeks of gestation who underwent cervical ripening after ≥ 24 hours of PROM in specific time frames in two Dutchsecondary care and teaching hospitals. The primary outcome was the incidence of intrapartum infection, a composite of maternal and neonatal infection. In addition, we evaluated the mode of delivery, duration of priming and priming-to-delivery interval. Secondary endpoints included uterine hyperstimulation, umbilical cord prolapse, birth weight, Apgar scores, length of admission to the neonatal low dependency unit, admission to the (neonatal) Intensive Care Unit (ICU) and mortality. Statistical analyses included bivariate and multivariate techniques. Results: Cervical ripening with FC, compared with oral misoprostol, showed a higher incidence of intrapartum infection, respectively 32.7% (n = 16) vs. 12.7% (n = 10) (p = 0.006). However, after adjusting for epidural anaesthesia and pregestational BMI, the association was no longer significant. No difference was found in mode of delivery and total priming-to-delivery interval (median 21.3 hours vs. 22.0, p = 0.897).