M. gracilis

M. gracilis may refer to:
 * Machaeranthera gracilis, a flowering plant species
 * Macroramphosus gracilis, the slender snipefish, a fish species
 * Madia gracilis, the grassy tarweed and slender tarweed, a flowering plant species
 * Maxillaria gracilis, the delicate maxillaria, an orchid species native to eastern and southern Brazil
 * Melanotaenia gracilis, the slender rainbowfish, a fish species endemic to Australia
 * Melanonus gracilis, the pelagic cod, a small deepwater fish species found in the Southern Ocean
 * Meliphaga gracilis, the graceful honeyeater, a bird species
 * Melomys gracilis, the black-tailed mosaic-tailed rat, a rodent species
 * Micrathena gracilis, the spined micrathena, a spider species
 * Microcephalophis gracilis, the graceful small-headed sea snake or slender sea snake, a snake species
 * Microgale gracilis, the gracile shrew tenrec, a mammal species endemic to Madagascar
 * Mylochromis gracilis, a fish species endemic to Malawi
 * Myurella gracilis, Lindb., a sea snail species in the genus Myurella