Human resource is an organizational capital and its mental health is one of the most important dimensions. The mental health has a significant effect on performance of staffs. The current research aimed to examine the mental health and its dimensions in librarians of Shahid Sadoughi university in 2016. This is a descriptive-analytical study with correlational design among librarians working in libraries of Shahid Sadoughi university. Goldberg & Hiller general health questionnaire was used to evaluate general health of librarians. Data were then analyzed using descriptive statistics, independent T test, variance analysis, and Pearson correlation coefficient through SPSS software version 19. Results indicated that the mean score of librarians' general health was 22.8±10.38 which shows that participants were healthy. Furthermore, marital status was associated with health and its components so that married individuals were less healthy. Depression rate of librarians was low but most of them suffered from physical problems, anxiety, sleep disorders, and social conflicts. Therefore, librarians' authorities should  consider such problems and develop strategic plans for them.