The study examined the assessment of job satisfaction of employees’ in Ahmadu Bello University Library Zaria. Survey research design was adopted for the study. Total population was 359 librarians in made up of professionals and para-professionals. Total enumeration was used for the study. The instrument for data collection was a validated questionnaire. Cronbach’s alpha results ranged from 0.86 to 0.90. The response rate was 87.5%. Data were analyzed using Pearson product Moment Correlation and Multiple Regression. The findings revealed that librarians’ level of Normative commitment is high; while their Affective and Continuance employees’ commitment in Ahmadu Bello University Library Zaria, Nigeria is low. The study concluded that librarians’ level of assessment was determined by the extent of employees’ commitment. The study recommended that for management of Ahmadu Bello University Library Zaria to succeed, they must find means of promoting job satisfaction among their employees