John Ussher

John Ussher may refer to:


 * John Ussher, publisher in 1571 of Aibidil Gaoidheilge agus Caiticiosma, the first book printed in Ireland in the Irish language
 * John Ussher (died 1741) (c. 1682–1741), Irish MP for Carrick
 * John Ussher (died 1749) (1703–1749), Irish MP for Dungarvan
 * John Ussher (1730–1796), Irish MP for Innistiogue
 * John Ussher (priest) (died 1835), Irish Anglican priest
 * Johnny Ussher (1830–1879), Canadian gold commissioner