Copac is a union catalogue which provides free access to the merged online catalogues of many major research libraries and specialist libraries in the United Kingdom and Ireland, plus the British Library, the National Library of Scotland and the National Library of Wales. It has over 40 million records from around 90 libraries, representing a wide range of materials across all subject areas. Copac is freely available to all.
Copac is a Mimas service based at the University of Manchester. It is funded by Jisc and uses records supplied by RLUK (Research Libraries UK) and specialist libraries with collections of national research interest. "Copac" is a registered trademark of the University of Manchester, no longer standing for CURL Online Public Access Catalogue.