A. flavescens may refer to:
Acacia flavescens, a tree native to eastern Australia Acanthoscelides flavescens, a bean weevil Acromyrmex flavescens, a leaf-cutter ant Adelotopus flavescens, a ground beetle Adelpherupa flavescens, a grass moth Aedes flavescens, a mosquito that carries heartworm Agathis flavescens, a conifer endemic to Peninsular Malaysia Agave flavescens, a Mexican plant Aglaia flavescens, an Oceanian plant Alternanthera flavescens, a flowering plant Alyxia flavescens, an Australasian dogbane Amaranthus flavescens, an annual plant Anoectochilus flavescens, a jewel orchid Anoteropsis flavescens, a wolf spider Antennaria flavescens, a daisy native to western North America Anthenea flavescens, a sea star Anthericum flavescens, a flowering plant Anthurium flavescens, a flamingo flower Antigonon flavescens, an American buckwheat Aphnaeus flavescens, an African butterfly Apoctena flavescens, a tortrix moth Apotomus flavescens, a ground beetle Apriona flavescens, a longhorn beetle Aquilegia flavescens, a North American wildflower Arcyria flavescens, an amoeboid protozoan Argostemma flavescens, a flowering plant Argulus flavescens, a carp louse Argyrodes flavescens, an Asian spider Ariteus flavescens, a bat endemic to Jamaica Aspergillus flavescens, a saprotrophic mold Astragalus flavescens, a plant native to the Northern Hemisphere Asura flavescens, an Asian moth Atelopus flavescens, a toad endemic to French Guiana Austrostipa flavescens, a true grass