A. grandis may refer to: * Abies grandis, the grand fir, giant fir, lowland white fir, great silver fir, Western white fir, Vancouver fir or Oregon fir, a tree species native to the Pacific Northwest and Northern California of North America * Aeshna grandis, the brown hawker, a large dragonfly species widespread in England * Alternanthera grandis, a plant species endemic to Ecuador * Angistorhinus grandis, an extinct phytosaur species found in Texas and Wyoming in the United States and that lived from the Late Triassic period * , a plant species in the genus Astelia native to New Zealand * Aublysodon grandis, a nomen dubium given to a large number of carnivorous dinosaur teeth