ObjectiveThe study aims to assess the quality of obstetric and newborn care using the WHO quality framework.DesignThe study used explanatory sequential mixed methods design.SettingThis study was conducted in 50 health centers in Addis Ababa city administration from January 25 to December 31, 2021.MethodsA total of 50 health centers were surveyed using a structured questionnaire and 500 women in the postpartum period were interviewed using a structured questionnaire. Delivery records of the 500 women were reviewed using a structured checklist. A total of 338 midwives were interviewed using a structured questionnaire. The quantitative data was analyzed using Statistical Package for Social Sciences (SPSS).ResultsThe study revealed that only a third of the 50 health centers were providing good quality care (a quality score ≥ 75%). All the health centers had the physical resources (100%) to deliver obstetric and newborn care. The majority of the health centers had a system for actionable information (92%), functional referral (80%), and providing dignified care (80%). On the other hand, only a few of the health centers met the quality threshold for effective communication (24%), evidence-based practice of routine obstetric and newborn care (36%), and availability of mechanisms to support and motivate skilled birth attendants (24%). None of the health centers met the quality threshold for emotional support during labour and delivery. Obstetric caregivers’ high workload and job dissatisfaction were barriers to quality care.ConclusionEnsuring quality obstetric and newborn care needs effective quality improvement interventions that aim to ensure women had effective communication, emotional support, and dignity during labour and delivery. Reducing the workload and increasing motivation of birth attendants play a critical role in improving the quality of care.Supplementary InformationThe online version contains supplementary material available at 10.1186/s12913-023-09414-7.