H. grandis may refer to: * Hadrobunus grandis, a harvestman species found in the United States * Haptodus grandis, a small sphenacodont species that lived from Latest Carboniferous to Early Permian in the equatorial Pangea * Hazelia grandis, a spicular demosponge species that lived during the Cambrian * Heosemys grandis, the giant Asian pond turtle, a turtle species found in Cambodia and Vietnam and in parts of Laos, Malaysia, Myanmar and Thailand * Hierodula grandis, the giant Asian mantis, a praying mantis species found in Bangladesh, Northeast India, and Myanmar * , a wolf spider species in the genus Hogna * Horsfieldia grandis, a plant species found in Indonesia, Malaysia and Singapore * Hylomyscus grandis, the Mount Oku hylomyscus, a rodent species found only in Cameroon * ,