Abstract: Manpower training leads to development of their potential, promotion of work methods and techniques of work, knowledge acquisition and increased job skills and prevention of resource loss for the organization. This is a descriptive study which is carried out in April 2015 to evaluate the effect of in-service training courses on employee empowerment among National Iranian South Oilfields Company (NISOC) employee in the years 2012-2014. A sample size of 148 employees was randomly selected from the population of the study, and standard questionnaires of leadership power, organizational commitment by Allen Meyer and average of the employee in specialized training courses were used for data collection. Descriptive and inferential statistics, frequency, mean, standard deviation, one way ANOVA, independent t-test, analysis of variance (ANOVA) were measured in statistical software of SPSS 21 for data analysis. The results showed that training courses have been effective in empowerment (leadership, organizational commitment and expertise) of the employee. In addition, no significant difference was found between effectiveness of training courses and empowerment of employee expertise in different field of studys and universities. But there was a significant difference between effectiveness of training courses, and empowerment of employee expertise based on their level and type of education. Therefore, considering the effectiveness of in-service training courses on employee empowerment, there is a necessary need for serious planning for appropriate military establishments for optimal implementation of these programs.