VuFind supports two forms of interlibrary loan: ILS-based ILL and external service-based ILL.

As of release 5.0, VuFind includes the option to use the Relais interlibrary borrowing platform for ILL requests. When an item is unavailable, VuFind can be configured to search Relais for copies at other libraries and to allow users to place requests directly from within the VuFind interface. To activate this feature, see the [Relais] section of config.ini.