C. aurantiaca may refer to:
Caladenia aurantiaca, an orchidoid orchid Callosamia aurantiaca, an American moth Caloplaca aurantiaca, a lichen found in the United States Caloptilia aurantiaca, a leaf miner Canna aurantiaca, a garden plant Caragana aurantiaca, a flowering plant Catocala aurantiaca, an owlet moth Cattleya aurantiaca, an epiphytic orchid Chrysomphalina aurantiaca, a gilled mushroom Coccinia aurantiaca, a scarlet gourd Coenyra aurantiaca, a brush-footed butterfly Cronia aurantiaca, a sea snail Curcuma aurantiaca, a flowering plant