A. montanus may refer to:
Acanthus montanus, or mountain thistle Adaina montanus, a moth Aenetus montanus, a moth Agapetus montanus, a caddisfly Alsodes montanus, a frog Anthodiscus montanus, a plant of the family Caryocaraceae Araeococcus montanus, a synonym of Pseudaraeococcus montanus, a plant of the family Bromeliaceae Astylosternus montanus, a frog
See also Montanus (disambiguation)