A. brassicae may refer to:
Acholeplasma brassicae, a wall-less bacteria Aleyrodes brassicae, a whitefly with global distribution Alternaria brassicae, a plant pathogen Anthomyia brassicae, a pest of crops Aphis brassicae, a destructive aphid Ascobolus brassicae, an apothecial fungus Asteromella brassicae, a plant pathogen