Community Policing is increasingly recognized as playing an important role in fostering security and ensuring that crime is prevented. This in turn provides a conducive environment for the residents in every society to work in. Despite the official launch of community policing as a crime prevention strategy, crime levels are still on the rise within cities, towns, estates and villages in form of violence, organized terror gangs, violent robbery, abductions, poaching, cattle rustling, terrorism, and murders. This study sought to determine the effect of community policing strategy on crime prevention in Nairobi County, Kamukunji Sub County, Kenya. The study was guided by the social capital theory, routine activities theory and normative sponsorship theory. It adopted mixed method research approach and descriptive survey research design as guided by the positivist paradigm. The population targeted was one which gave the required information on the study in line with the objectives of the study. This was a total of 250 individuals who comprised of 70 administrators, 80 police officers and 100 community members in Kamukunji Sub-County. A sample of 100 respondents comprising of 28 administrators, 32 police officers and 40 community members was obtained from the population by use of Zikmund (2000) model. The study adopted combination of purposive sampling, stratified sampling and simple random sampling techniques. Primary data was collected by use of structured questionnaires using the drop and pick method and analyzed with the aid of SPSS (Version 20) software. Expert opinion was sought on the validity of the research instrument while the reliability coefficient was determined using Karl person’s product moment correlation coefficient. Data was analyzed by use of descriptive statistics, correlation analysis and regression analysis. The study revealed that there was statistically significant relationship between community policing strategies and crime prevention. It recommended that there should be mechanisms of educating the community on the importance of partnership between the police and the community. This should be conducted in a way that will address the misconceptions and mistrust among the parties.