The present study aimed to investigate and compare Dewey Decimal Classification, Library of Congress Classification, Bliss bibliographic classification, and Colon Classification by Ranganathan with the criteria of an appropriate classification to identify the best library classification system from the viewpoint of professors and librarians. The present study was applied in terms of purpose and was conducted using a survey method. Data collection was conducted by Delphi method. The research population included cataloging experts including professors and librarians from Ferdowsi University of Mashhad and librarians of Astan Quds Razavi of whom ten subjects were selected through targeted sampling. In order to analyze the data, descriptive and inferential statistics and SPSS software were used. The results showed a difference between the classifications with the criteria of an appropriate classification and the best library classification was Colon Classification. There was a significant difference between the studied different library classifications in comparison with classification criteria in the group of professors, librarians, and the two groups. In addition, there was a significant difference between the viewpoints of professors and librarians regarding each of the studied classifications in terms of Dewey Decimal classification but there was no significant difference between the other studied classifications.

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