Maternal healthcare is an integral part of the Millennium development goals. However, most developing countries have been experimenting with different types of interventions to increase access and utilization of maternal care services. Health care devolution was greeted with great anticipation in Kenya as a means of bringing services closer to the people. However, since the implementation of the recent devolution reforms, criticism has mounted, with evidence of corruption, poor management, late payment of county staff and considerable disaffection among service providers, especially health professionals. Thus, this study assessed the effects of devolution on maternal health care in Nairobi City County in Kenya.  Particularly, the study examined the situation of maternal healthcare before and after devolution and how devolution as affected provision of maternal healthcare in Nairobi City County. The study also assessed how devolution affected maternal health care programs implementation and the challenges facing the devolved maternal health care in Nairobi City County. The study adopted the systems approach and the decentralization theorem. This study employed a descriptive research design and the population of the study was made up of the 4 level four hospitals in Nairobi County and all the 189 selected medical health workers in the hospitals. A sample of 57 respondents was selected through simple random sampling. Additionally, the study used questionnaires and an interviews guide to collect data. The questionnaires were administered to the sampled medical workers and the interviews schedules were administered to the key informants who comprised of the medical superintendent from every hospital. Quantitative data was collected through the use of the questionnaires was analyzed using descriptive statistics with the aid of the Statistical Package for Social Sciences. Qualitative data was analyzed using content analysis