Library of a university considered as an important entity of a university and employees of the library have a key role to play in disseminating knowledge to the academic clientele in the university. This study conducted to comprehensively investigate the job satisfaction of employees as the main objective and followed by identifying the main factors and finally to provide suggestions to overcome the dissatisfaction level of jobs of staff serving in respective universities. Study sample comprised with 510 respondents representing all professional, para-professional and support staff categories working in 14 university libraries in Sri Lanka. Semi structured questionnaire with five point likert scale used to collect quantitative data for the study. The study findings indicates that university library employees were moderately satisfied with their jobs and in general and co-workers, salary and benefits, physical working condition, career development opportunities, work itself, appreciation and feedback identified as the main factors of job satisfaction. The present study recommend to take immediate measurements to enhance the level of job satisfaction among employees by enhancing a collaborative working atmosphere, provide more career development opportunities, establish a proper mechanism for provide appreciation and feedback to enrich the current level of job satisfaction of library staff.