John Eyton Bickersteth Mayor FBA (28 January 1825 – 1 December 1910) was an English classical scholar, writer and vegetarianism activist.

His best-known work, an edition of the thirteen Satires of Juvenal, is notable for an extraordinary wealth of illustrative quotations.

His Bibliographical Clue to Latin Literature (1875), based on Emil Hübner's Grundriss zu Vorlesungen über die römische Litteraturgeschichte, was a valuable aid to students, and his edition of Cicero's Second Philippic became widely used.

[2] Mayor also edited the English works of John Fisher, Bishop of Rochester (1876); Thomas Baker's History of St John's College, Cambridge (1869); Richard of Cirencester's Speculum historiale de gestis regum Angliae 447–1066 (1863–69); Roger Ascham's Schoolmaster (new ed., 1883); the Latin Heptateuch (1889); and the Journal of Philology.

Mayor succeeded Francis William Newman as president of the Vegetarian Society[3] in 1884 and remained in that position till his death.