The need for multilingual information access has been addressed in many forms for several years. The Association for Library Collections & Technical Services (ALCST) Non-English Access Committee indicated that research in the area of assigning subject headings in the language of the script will enable the user to find materials in the library more efficiently. It also indicated that Library of Congress Subject Headings (LCSH) does not sufficiently represent the culture of the Arabic and Islamic world. Several examples of the deficiency of LCSH coverage in these areas illustrate the need to develop an Arabic open-source controlled vocabulary that can be used when assigning subject headings for Arabic materials. This presentation aims to address three issues: • The LCSH and its coverage of Arabic subjects • Enhance the discoverability of Arabic material by adding the Arabic subject headings • The development of the open access Arabic thesaurus based on the linked-data approach; there will be a demo to the thesaurus