Worldwide

  • English

Dewey® Services

Organize your materials with the world's most widely used library classification system.


DDC 23 books

Organize your collection

Libraries big and small the world over use the Dewey Decimal Classification (DDC) system to help make sense of today's complex library collections. The DDC is available in both print and Web formats and in full and abridged editions.

Try WebDewey free for 30 days »

Learn more about Dewey services


Break down language barriers

The DDC system has been translated into more than 30 languages and serves library users in more than 200,000 libraries in 135+ countries worldwide, making it the world's most widely used library classification system. More than 60 of these countries use the DDC to organize their national bibliographies.

Learn more about Dewey services

Asian students using a laptop computer

Person getting updates on a laptop

Get timely updates

Integrate updates to the DDC through continual updates to the WebDewey® service.

Learn more about Dewey services

"The DDC is a quick way to give our patrons a place to start to browse on the shelves and uncover resources not detected through a simple catalog search."

Dennis Brandewie
Oaklyn Branch Library, Evansville Vanderburgh Public Library

Learn more

Dewey Services brochure cover

Download the brochure
Learn more about organizing your materials with the world's most widely used library classification system.


The Dewey blog is a great source for news and views on classification issues as well as interesting and unusual DDC resources and curiosities. It's also a convenient way to share feedback directly to the DDC editors to help shape the future of the DDC.

Past and recorded events

Watch this space for past and recorded Dewey Services events.

See all Dewey services events »

Recent news

All copyright rights in the Dewey Decimal Classification system are owned by OCLC. Dewey, Dewey Decimal Classification, DDC, OCLC and WebDewey are registered trademarks of OCLC.