Survival and growth of business ventures is a key concern which is determined by varied factors. Entrepreneurship training has been identified as one factor that can play varied roles towards growth of micro and small enterprises across the world. The purpose of this study was to assess the effect of four components of entrepreneurship training on business growth among micro and small enterprises in Kiambu County. The four components of entrepreneurship training to be studied are objectives, content, trainers’ competence/ attitudes and training delivery methods/presentation styles. The study was grounded in Blooms taxonomy and theory of planned behaviour. The study adopted mixed methods (both quantitative and qualitative) research design and applied a descriptive study design. The population for the study was 6,420 licensed MSEs operating in Ruiru Sub County. The study utilized stratified random sampling to select 382 respondents in main trading centres in each of the four administrative wards based on the nature of business they are involved. The study relied on primary data collected using questionnaires from owners and key employees of the selected micro and small enterprises. The data gathered were analysed using descriptive statistics and thematic analysis. The study found that entrepreneurship training components contributed to a certain extent towards business growth among the micro and small enterprises. The study thus recommends customization of entrepreneurship training programs and taking into consideration of the input of the owners and employees to improve its impact on the survival and growth of the business enterprises.