John Brenan

John Brenan may refer to:
 * John Brenan (bishop) (died 1693), Irish Roman Catholic archbishop
 * Ryan Brenan (John Ryan Brenan, 1798–1868), Australian politician
 * John Brenan (physician) (1768–1830), Irish physician
 * John Fitzgerald Brenan (1883–1953), British diplomat in China
 * John Patrick Micklethwait Brenan (1917–1985), British botanist