图书馆五律（Five Laws of Library Science），是由印度学者阮甘纳桑（S.R. Ranganathan），于1931年所首创，迄今已达70余年的时间，仍受到图书馆界所引用，奉为圭臬，其内容为：
英语百科
Five laws of library science 图书馆五律
The Five laws of library science is a theory proposed by S. R. Ranganathan in 1931, detailing the principles of operating a library system. Many librarians worldwide accept them as the foundations of their philosophy.