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
See also John Usher (disambiguation) Ussher (surname)