Libdex: The Library Index   

Libweb: Library Servers Via WWW

Lib-web-cats

PublicLibraries.com

UNESCO Libraries Portal

Yahoo! Directory - Libraries

National Libraries

Library of Congress - The national library of the United States.

National Agricultural Library - From the United States Department of Agriculture.

National Libraries of the World 

National Library of Medicine

Library Directories in Print

American Library Directory - A classified list of libraries in the United States and Canada, with personnel and statistical data.  On the Quick Reference Shelves located behind the Reference Desk at this call number: Z731 .A53

Europa World of Learning - This directory lists major institutions of learning worldwide, including colleges, universities, and libraries. In the Reference Collection at this call number: AS2 .W6