The Olabisi Onabanjo University Library is comprised of the under listed departments and units:
- Department of Collection Development
- Acquisition Section
- Gifts and Exchanges Section
- Acquisition Section
- Department of Technical Services
- Cataloguing and Classification Section
- Card Production, Catalogue Maintenance Section
- Cataloguing and Classification Section
- Department of Readers’ Services
- Circulation Section
- Reprographic & Bindery Section
- Department of Serials Management
- Journals Section
- Newspaper/Magazine Section
- Journals Section
- Department of Reference & Bibliographic Services
- Department of Multimedia Resources
- Audio Visual Unit
- E-Library Section