The largest archive of medieval art in the world, the Index of Christian Art was founded by Professor Charles Rufus Morey in 1917 and is based at Princeton University. The Index documents primarily Christian art from early apostolic times to approximately 1400 A.D. and contains over 26,000 terms that deal predominantly with Christian iconography as well as Jewish, Islamic, and nonecclesiastical subjects. The Index consists of three components: the Subject file, the Photographic file, and the Database.

For a complete history, visit the official website of the Index of Christian Art at http://ica.princeton.edu.

The Research Institute provides onsite Internet access to the Index. At the Research Library, a computer station in the stack area of the medieval section provides convenient Internet access to the Index, Photo Study Collection databases, and the Research Library Catalog.

In addition to Internet access, the Research Library is one of only four places in the world to hold a repository copy of the Index, which is available for on-site research by Stack Readers, Extended Readers, Getty staff, in-residence Getty scholars and fellows, and Getty interns.

Access may also be granted to independent researchers with specific projects or interests, upon approval of a brief application. Undergraduates must present, in addition to the application, a memo from a faculty member indicating their research need.

Conveniently located adjacent to the medieval section of the Photo Study Collection, the repository copy of the Index may be consulted during the Research Library's regular hours, Monday–Friday, 9:30 a.m.–5:00 p.m.

An initial appointment is required to orient new users to the Index.