John Jeffreys

John Jeffreys may refer to:

• John R. F. Jeffreys (1916–1944), British mathematician and World War II codebreaker
• John Gwyn Jeffreys (1809–1885), British conchologist and malacologist
• J. G. Jeffreys (1893–?), Australian schoolteacher who moved to England and founded Bryanston School in Dorset
• John Jeffreys (died 1689), British member of parliament for Brecon and Breconshire
• John Jeffreys (died 1715) (c. 1659–1715), British member of parliament for Breconshire, Marlborough and Radnorshire
• John Jeffreys (1706–1766), British member of parliament for Breconshire and Dartmouth

See also

• John Jeffrey (disambiguation)
• John Jeffries (disambiguation)