A. montanum may refer to: Aecidium montanum, a rust fungus Allium montanum, a flowering plant Altagonum montanum, a ground beetle Alyssum montanum, a flowering plant Anadendrum montanum, an epiphytic or epipetric flowering plant of Indonesia Anthurium montanum, a flowering plant of Central America Aridarum montanum, an aquatic plant of Borneo Aspidodiadema montanum, a sea urchin Asplenium montanum, a fern of the eastern United States