ABSTRACT: The study examined the mediating effect of role ambiguity on role relationship between job stress and employee commitment of Deposit Money Banks in Southwest, Nigeria. A descriptive survey research design was adopted for the study. The population of the study constituted Deposit Money Bank staff in Southwest, Nigeria. The sample size was 395 using Yamane sampling model. Primary data used for the study were gathered through structured questionnaire and the data gathered were analyzed using regression and Sobel test. The result showed that job stress mediating effect of role ambiguity significantly affect employee commitment (t=21.112, t=21.306, P<0.05) all at 0.05 level of significance. The study concluded that role ambiguity and job stress statistically and significantly affects employee commitment among Deposit Money Bank in Southwest, Nigeria.

Keyword: Job Stress, Role Ambiguity, Employee Commitment