Purpose: the purpose of this study is to measure Mazandaran Province public librarians' attitudes toward knowledge management including trust, reward system, openness, cooperation, and knowledge sharingMethodology: The study is an applied research, and survey method is used. 110 librarians of Mazandaran Public libraries took part in this survey. The research measured viewpoints of librarians in 9 months during 2010-2011. Questionnaires 'Cronbach's Alpha about confidence, attitude, cooperation, and reward, and openness in communication was 73%, and about attitude and knowledge management was87 %. SPSS v.17 is used in this study. In the analysis Pearson correlation coefficient R for testing hypotheses is used.Findings: Results showed that there is a meaningful relation among correlations across the variables of attitudes to knowledge management, trust, openness, and reward of librarians of public libraries of Mazandaran province and knowledge sharing.Conclusion: This study emphasizes the importance of greater cooperation between librarians for promoting the development of knowledge management, collaboration, and knowledge sharing.