The DU library is one of the main pillars of the educational process at the university. It is called Sheikh Mustheel bin Ahmed bin Ali Al-Mashani’s library. It was established in 2004 and moved to the current building in 2010.

DU library provides information services to students and faculty from various sources, such as books, references, periodicals and other electronic databases and Websites. The current printed sources collection consists of over (39,500) Thirty-nine thousands and five hundred books and references, more than (559,500) five hundred and fifty-nine thousands and five hundred of electronic books, and more than (54,153) fifty-four thousand and one hundred fifty-three of e-journals, (3,160,500) three million one hundred and sixty thousands and five hundred of electronic university theses and (3,000) Three thousands of Printed Theses. The library provides the services of counselling, lending, and reserving for all eligible individuals.

The library is located in a separate building which consists of three floors with a total area of 4000 square meters equipped with a lift. The library occupies a convenient place amid university colleges and administration building. The building is divided into reading rooms, computer labs and special shelves for books, references, and periodicals. It also has administrative departments that manage technical operations and provide services for library users.

The library uses electronic systems such as Virtua and RFID to computerize the holdings and management affairs. The library uses Library of Congress Classification system, MARC 21 system and Resource Description and Access (RDA) which is successor to the standard of Anglo-American Cataloging Rules 2nd edition (AACR2) for organizing the library sources. This enables students to search for books through the e-library site on the internet. In the library there are computers distributed among the floors along with three computer labs with 90 computers for search in the internet and a computer lab with 40 computers in the electronic library for searching electronic resources e.g. books, journals, electronic and theses.

The library seeks to ensure an appropriate environment enhanced with rich information to serve beneficiary community for all majors and research according to the university programs. The library works on qualifying and training its staff to be able to employ professional methods and modern technology in the processing and delivery of information services for the library users. The library offers its services through five departments with specific tasks as follows: Acquisition Department, Circulation Department, Reference Department, Cataloguing and Classification Department, periodicals and e-Library. The library is open on all working days from 7.30 am to 8.00 pm.