John Brett
John Brett may refer to:
- John Brett (artist), British artist associated with the Pre-Raphaelite movement
- John Brett (chronicler), English author of Brett's Narrative, about the Marian exiles
- John Brett (bishop), bishop of Elphin
- John Brett (Royal Navy officer), Royal Navy admiral
- John Brett (rugby union), English international rugby union player
- John Aloysius Brett, administrator in British India
- John Michael Brett, nom de plume of English author Miles Tripp
- John Watkins Brett, English telegraphic engineer
- John Henry Brett, Irish architect, builder, and county surveyor