Fieldia may refer to a number of different genera in various scientific fields:
Botany Fieldia (plant) A. Cunningham, 1825, a genus of plants in the family Gesneriaceae. Fieldia is also used as a common name for Fieldia australis, a species in this genus Fieldia Gaudichaud, 1829, a synonym of the orchid genus Vandopsis
Zoology Fieldia K. Johnson, 1991, a synonym of Calycopis a genus of butterfly in the family Lycaenidae Fieldia Niculescu, 1979, a synonym of Vanessa (butterfly)
Paleontology Fieldia (worm) Walcott, 1912, a genus of worms in the family Fieldiidae