Abstract: This study sought to establish the influence of consumer sales promotions on buying behavior of Three-Wheeled vehicles in Nairobi County, Kenya. The population for this study was all 350 operators of Three-Wheeled vehicles registered with various Sacco’s operating within Nairobi County. According to the NTSA (2015), there are 350 registered three-wheeled vehicles operating in Nairobi. Stratified random sampling at rate of 30% was used to select a sample size of 105 members. Primary data was gathered using questionnaires whereby validity and reliability of the instruments were tested prior to actual collection of data on 10% (11) of the sample. Quantitative data was analyzed using descriptive statistics aided by a Statistical Package for the Social Sciences (SPSS) and Excel. Also advanced techniques of data analysis such as multiple regression analysis were conducted to determine the relationship between dependent and independent variables.