John Gilbert (c. 1812 – 28 June 1845) was an English naturalist and explorer. Gilbert is often cited in the earliest descriptions of many Australian animals, many of which were unrecorded in European literature, and some of these are named for him by those authors. Gilbert was sent to the newly founded Swan River Colony and made collections and notes on the unique birds and mammals of the surrounding region. He later joined expeditions to remote parts the country, continuing to make records and collections until he was killed during a violent altercation at Mitchell River (Queensland) on the Cape York Peninsula.