M. grandis

M. grandis may refer to:
 * Meconopsis grandis, the blue Poppy, a flowering plant found in Bhutan
 * Melanella grandis, a very small ectparasitic sea snail species in the genus Melanella
 * Melanodexia grandis, a fly species in the genus Melanodexia
 * Menegazzia grandis, a lichen species found in Australia
 * Mexitlia grandis, a spider species in the genus Mexitlia found in Mexico
 * Millettia grandis, a legume species found in South Africa
 * Miohippus grandis, a prehistoric horse species found in now North America that lived from the late Eocene to early Miocene
 * Moneta grandis, a spider species in the genus Moneta endemic to India
 * Mullerornis grandis, an extinct elephant bird species found in Madagascar

Synonyms

 * Makalata grandis, a synonym for Toromys grandis, the giant tree rat or white-faced tree rat, a spiny rat species found in Brazil