The purpose of this research was to explore the organizational commitment and compare factors affecting the organizational commitment as well as study the relationship of the factors affecting the organizational commitment of Rajamangala University of Technology Phra Nakhon personnel. 303 samples were asked to respond to a questionnaire which was used as a research tool. Statistics used for the data analysis were percentage mean One-Way ANOVA and significance level at 0.05. The results of this research revealed that the overall personnel of Rajamangala University of Technology Phranakhon were organizationally committed in good level as well as their work life quality. In addition the level of organizational commitment of the personnel with dissimilarities in terms of the age marital status educational level work experience were 0.05 statistically different. In addition to that the overall job characteristics were positively correlated with overall organizational commitment and work experience. In the Operate overall this was positively associated with the overall organizational commitment.

The purpose of this research is to study Quality of work life affecting Organizational Commitment of private companies’ employees in Lopburi Province. Sample size in this research is 400 samples. Questionnaire is a tool for data collection. Statistics for data analysis are percentage mean standard deviation t-test one-way analysis of variance and multiple regressions analysis. Research results are as follows: Organizational commitment in the dimension of Strong belief in and acceptance of the organization’s goals has the relationship with Development of Human Capacities and Social Relevance. Organizational commitment in the dimension of Willingness to exert considerable effort on behalf of the organization has the relationship with Adequate and Fair Compensation Development of Human Capacities and Work Life Balance. Organizational commitment in the dimension of Strong desire to maintain membership in the organization has the relationship with Adequate and Fair Compensation Growth and Security and Social integration.