John Brett

John Brett may refer to:
 * John Brett (artist) (1831–1902), British artist associated with the Pre-Raphaelite movement
 * John Brett (MP) for Much Wenlock
 * John Brett (chronicler) ( 1556), English author of Brett's Narrative, about the Marian exiles
 * John Brett (bishop) (died 1756), bishop of Elphin
 * John Brett (Royal Navy officer) (died 1785), Royal Navy admiral
 * John Aloysius Brett (1879–1955), administrator in British India
 * John Michael Brett, nom de plume of English author Miles Tripp (1923–2000)
 * John Watkins Brett (1805–1863), English telegraphic engineer
 * John Henry Brett (1835–1920), Irish architect, builder, and county surveyor