IMPORTANCE Research has shown an association between opioid prescribing after major or minor procedures and new persistent opioid use. However, the association of opioid prescribing with persistent use among women after vaginal delivery or cesarean delivery is less clear. OBJECTIVE To assess the association between opioid prescribing administered for vaginal or cesarean delivery and rates of new persistent opioid use among women. DESIGN, SETTING, AND PARTICIPANTS This retrospective cohort study used national insurance claims data for 988 036 women from a single private payer from January 1, 2008, to December 31, 2016. Participants included reproductive age, opioid-naive women with 1 year of continuous enrollment before and after delivery. For participants with multiple births, only the first birth was included. EXPOSURES Peripartum opioid prescription (1 week before delivery to 3 days after discharge) captured by pharmacy claims, including prescription timing and size in oral morphine equivalents. Multivariable adjusted odds ratios were estimated using regression models. MAIN OUTCOMES AND MEASURES Rates of new persistent opioid use, defined as pharmacy claims for 1 or more opioid prescription 4 to 90 days after discharge and 1 or more prescription 91 to 365 days after discharge among women who filled peripartum opioid prescriptions. RESULTS In total, 308 226 deliveries were included: 195 013 (63.3%) vaginal deliveries and 113 213 (36.7%) cesarean deliveries. Participant mean (SD) age was 31.3 (5.3) years, and 70 567 (51.0%) were white patients. Peripartum opioid prescriptions were filled by 27.0% of women with vaginal deliveries and 75.7% of women with cesarean deliveries. Among them, 1.7% of those with vaginal deliveries and 2.2% with cesarean deliveries had new persistent opioid use. By contrast, among women not receiving a peripartum opioid prescription, 0.