Abstract: The main aim of this study was to establish the relationship between training and the performance of micro and small enterprise in Kisii County, Kenya. The objective of the study was to establish the relationship between managerial training and the performance of MSEs in Kisii County. A descriptive survey design was used to carry out the study. The target population was 12,772 owner managers. The sample size was 384 which obtained through simple stratified random sampling where 9 strata were studied. Data was collected using questionnaires, interview schedules and observation checklist. Data was analyzed using Statistical Package for Social Sciences (SPSS) version 20.0 computer software. The hypothesis was also tested using the t- test. Results of the managerial training were found to be satisfactory in explaining performance of micro and small enterprises in Kisii County. This was supported by coefficient of determination also known as the R square of 75.7%. This means that independent variable explain 75.7% of the variations in the dependent variable which is performance of micro and small enterprises in Kisii County. The ANOVA results indicate that the overall model was statistically significant. This was supported by an F statistic of 214.536 and the reported p value (0.000) which was less than the conventional probability of 0.05significance level. Regression of coefficients showed that managerial training and performance of micro and small enterprises in Kisii County had a positive and significant relationship (r=2211681.748 p=0.000. The R2 before moderation was 75.7% but after moderation the R2reduced to 49.6%. This implies that legal requirements reduce the performance of micro and small and enterprises in Kisii County. The study concluded that managerial training influences the performance of micro and small enterprises in Kisii County. It was recommended that that more managerial training should be organized for Micro and Small Enterprises in Kisii County.