Introduction: Job motivation as one of the factors that affect the behavior of librarians can improve their performance. Considering that organizational culture is one of the factors influencing job motivation, the aim of this study was to identify dimensions of organizational culture that can affect job motivation of librarians in public libraries of Iran.
Methods: This qualitative study was conducted using content analysis. Using the purposive sampling, 19 people of librarians of public libraries in 10 provinces were interviewed using depth and semi-structured interviews. After extracting the primary codes, they classifyied into three dimmensions and eight components.
Results: Based on the results of this study, dimmensions of organizational culture, which can affect job motivation included knowledge-oriented and capability-oriented culture (professionalism and meritocracy, professional capability, use of technology, and organizational learning), independency culture (non-politicization in the library, and decentralization), and participatory and motivational leadership culture (participatory management, and motivational management).
 In view of nature and social roles of public libraries and broad impressive factors on them, these models have limitations to assess status of organizational culture in public libraries. So, it is necessary to identify dimensions and components of effective organizational culture in public libraries of Iran and then manage the organizational culture on the basis of this effective culture.
Conclusions: Dimensions and components of effective organizational culture resulted from this study can be used as an ideal model for managing organizational culture or efforts to rule these cultural components in the public library of Iran.