图书分类法 是图书馆为了方便图书收藏和借阅而采取的一种分类方法，一般分类法分为基本法，按主题分类；附加法按年代、地域、语言分类；还可以人为按版本、规格等分类。

• 杜威十进制图书分类法
• 通用十进制图书分类法
• 中国图书分类法
• 赖永祥中文图书分类法
• 何日章中国图书十进分类法
• 日本十进分类法
• 中国科学院图书馆图书分类法

A library classification is a system by which library materials are arranged according to subject. Library classifications use a notational system that represents the order of topics in the classification and allows items to be stored in that order. Library classification systems group related materials together, typically arranged in a hierarchical tree structure. A different kind of classification system, called a faceted classification system, is also widely used which allows the assignment of multiple classifications to an object, enabling the classifications to be ordered in multiple ways. The library classification numbers can be considered identifiers for resources but are distinct from the International Standard Book Number (ISBN) or International Standard Serial Number (ISSN) systems, which are unique commercial product identifiers.Today many classification schemes are available i,e, DDC, CC, UDC.