First published in 1928, the Aslib Directory is the leading information sources reference work on organizations of all kinds. Now published in its fifteenth edition, the title's diversity is reflected by the wide spectrum of entries. The Directory is widely regarded as the best publication of its type.

The Aslib Directory of Information Sources in the United Kingdom provides instant access to listings of 6,800 associations, clubs, societies, companies, educational establishments, institutes, commissions, government bodies, and other organizations which provide information freely or on a fee-paying basis.
Entries in the fourteenth edition included:

• Epilepsy Research Foundation
• Parentline Plus
• Donkey Breed Society
• Centre for Buckinghamshire Studies
• Environmental Law Foundation.

Each entry is listed alphabetically and includes the organization's name and contact details, type and purpose, and lists publications and collections where appropriate. The Directory also contains a comprehensive index of acronyms and abbreviations and a substantial subject index.