A. montanum

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