The study sought to find out the effects of Rapid Results Initiatives (RRI) on service delivery in the civil service of the republic of Kenya. The research covered Mombasa County which comprises of four Sub Counties namely; Likoni, Changamwe, Kisauni and Mombasa and basically focused on the employees of the departments of Coordination of National Government, the National Police Service and Registration of Persons which fall under the Ministry of Interior and Coordination of National Government. The period of investigation stretched from August 2006 when the implementation of RRI commenced in the Ministry of Interior and Coordination of National Government to 2013. The study is important because the Government had undertaken to introduce results focus in service delivery within the public sector through implementation of RRI to address discontent among the members of the public because of unsatisfactory service delivery. Therefore, there is need to establish the effects of Rapid Results Initiatives on quality, effectiveness and efficiency of services delivered to the members of the public. The findings of this study will inform the policy makers at the Ministry if RRI programme is having positive effects on service delivery. The study employed descriptive research design where a sample size of 94 respondents was involved in the gathering of data. The respondents were selected through stratified random sampling from a target population of 940 respondents. The data was sourced through questionnaires. Collected data was sorted, cleaned, coded and analyzed by the aid of statistical package of social scientist programme (SPSS).The data was tabulated, analysed and presented in form of tables, pie charts, and figures. The study found out RRI had positive effects on service delivery. Most respondents (43.5%) agreed that establishment of anti corruption plans and boxes improved service delivery and reduced corruption cases. 58.7% agreed that security had improved and 82.7% agreed that customer care desks had contributed to improved service delivery. 77.6% agreed that service charters had been instrumental in enabling members of the public to be aware of services offered and 60.8% agreed that complains and suggestion boxes enabled the heads of departments to get feedback from the members of the public.