C. exigua may refer to:
Calamintha exigua, a flowering plant Campanula exigua, a bluebell endemic to California Canistropsis exigua, a plant endemic to Brazil Canna exigua, a garden plant Claytonia exigua, a western North American wildflower Cnaphalocrocis exigua, a grass moth Corticarina exigua, a minute brown scavenger beetle Curcuma exigua, a perennial herb Cymbella exigua, a unicellular algae Cymothoa exigua, a parasitic crustacean