Frederick Debell Bennett (1806–1859) was an English ship surgeon and biologist.
Born to a family of means in Devon, England, in 1806, he obtained his Licentiate of the Society of Apothecaries (L.S.A.)
Bennett first served as Assistant Surgeon on the hospital ship Grampus, which was moored on the River Thames.
He described several species, including the whalesucker (Remora australis), the blue noddy and Cheilopogon nigricans.
After his return he practiced medicine in Southwark in London where he died in 1859 at the age of fifty-three.