The main purpose of the research was to investigate the relationship between organizational justice (OJ) and organizational citizenship behavior (OCB) in public librarians of Razavi Khorasan province. This research was a practical one based on survey method. The population included all librarians related to the Foundation of Public Libraries Organization of Razavi Khorasan. They were 270 people from which 159 ones were selected randomly as the sample size based on Krejcie & Morgan's sample size table. Two questionnaires were utilized to collect data in this study. Neihoff & Moorman's OJ questionnaire (1993) which included three dimensions (distributed, procedural and interactive justice). A fourth dimension, named information justice, was added to it. Podsakoff et al. (1990) questionnaire of OCB was used. Data were analyzed using descriptive and inferential statistics, and SPSS software. OJ values were less than desirable but OCB values were desirable from the respondents’ point of view. Pearson & Spearman correlation test results indicated a positive significant correlation between OJ and OCB. Results also showed that a significant difference was seen between OCB of librarians with various working experiences. Based on Duncan's post hoc, there were no significant differences between OCB of librarians with 6 to 15 years of experience compared to two other groups, but a significant difference was observed between OCB of librarians having less than 5 years of experience compared to those having more than 16 to 25 years background. While organizational justice has an essential role in promoting organizational citizenship behavior, results of this research can be helpful to improve organizational justice in libraries and subsequently more organizational citizenship behavior, and finally to promote the performance of libraries.

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