The English Short Title Catalogue (ESTC) is a comprehensive, international union catalogue listing early books, serials, newspapers and selected ephemera printed before 1801.

It contains catalogue entries for items issued in Britain, Ireland, overseas territories under British colonial rule, and the United States. Also included is material printed elsewhere which contains significant text in English, Welsh, Irish or Gaelic, as well as any book falsely claiming to have been printed in London.

The database contains nearly 470,000 entries, and represents the holdings of some 2,000 libraries world-wide.