University College Dublin (UCD) is the Republic of Ireland's largest university. It is located in Dublin, capital of Ireland.

The Library of University College Dublin dates from the establishment of University College Dublin (UCD) as a constituent college of the National University of Ireland in 1908. It supports the learning, teaching and research needs of some 30,000 students and staff (plus a considerable number based in affiliated and otherwise related UCD programmes abroad).

There are 5 UCD libraries: the James Joyce Library at Belfield serves as the administrative centre of the library system: it accommodates the central services and 85% of the stock; the Health Sciences library (for medicine, nursing and physiotherapy) is located in the UCD Health Sciences Centre at Belfield; Architecture (for architecture, landscape and planning) is in the Richview precinct at Belfield; Veterinary Medicine, located in the Veterinary Sciences Centre at Belfield; the UCD Michael Smurfit School of Business Library at the Blackrock Campus.

In 2015 UCD Archives and the National Folklore Collection UCD were amalgamated with UCD Library, joining with UCD Special Collections to form a rich cultural heritage collection, one that is complemented by the successful and rapidly expanding UCD Digital Library. UCD Digital Library digitises materials from the UCD Heritage Collections and also from other externally held archives, to create an open access and globally accessible cultural heritage resource.