O. grandis
# O. grandis

O. grandis may refer to:

* Ocepeia grandis, an extinct Afrotherian mammal from the Paleocene epoch of Morocco
* Ocyale grandis, a wolf spider species in the genus Ocyale found in Togo, Congo and Namibia
* Oenothera grandis, a herbaceous flowering plant species in the genus Oenothera
* Oldenburgia grandis, a small gnarled tree species found in South Africa
* Onobrychis grandis, a Eurasian perennial herb species in the genus Onobrychis
* Oocorys grandis, a large sea snail species
* Opesia grandis, a fly species in the genus Opesia
* Ophiacodon grandis, an extinct large pelycosaur species found in Joggins, Nova Scotia, Canada and that lived in the early Permian
* Orthogeomys grandis, the giant pocket gopher, a rodent species found in Guatemala, Honduras and Mexico
* Oudenodon grandis, an extinct dicynodont species common throughout southern Africa during the Late Permian
