A. borealis may refer to: Abacetus borealis, a ground beetle Acanthothecis borealis, a script lichen found in Australia Achillea borealis, a synonym of Achillea millefolium, yarrow Acianthus borealis, the northern mosquito orchid, a plant found in Australia Acidicapsa borealis, a bacterium Ahaetulla borealis, the northern Western Ghats vine snake, a tree snake found in India Albertonykus borealis, a dinosaur Amaurobius borealis, a spider found in the United States and Canada Aneurus borealis, a flat bug found in North America Anisosticta borealis, a ladybug found in North America Aphidoletes borealis, a synonym of Aphidoletes aphidimyza, the aphid midge Aphoebantus borealis, a bee fly Apocephalus borealis, a parasitoid phorid fly Aradus borealis, a flat bug found in North America Archepandemis borealis, a moth found in North America Arctia borealis, a synonym of Arctia parthenos, the St. Lawrence tiger moth, found in North America Ariadnaria borealis, the boreal hairysnail, a sea snail found in the North Sea, the Arctic Ocean, and the Atlantic Ocean Armillaria borealis, a mushroom Artemisia borealis, a synonym of Artemisia campestris subsp. borealis, a plant native to Eurasia and North America Aspidophoroides borealis, a synonym of Aspidophoroides monopterygius, the alligatorfish, a marine fish found in the Atlantic Ocean Astarte borealis, the boreal astarte, a mollusc found in the Arctic, Pacific, and Atlantic Oceans