Vallisneria gigantea, the eelgrass, an aquatic plant species in the genus Vallisneria
Scolopendra gigantea | Rosa gigantea | Rhynchostylis gigantea | Myristica gigantea | Megateuthis gigantea | Epipactis gigantea | Edwardsina gigantea | Dinoponera gigantea | ''Dinocrocuta gigantea'' skull cast, University of Copenhagen Zoological Museum | Colocasia gigantea | Aristolochia gigantea | Agrostis gigantea | Agathia gigantea |
Agrostis gigantea, the redtop, a perennial grass native to Europe
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Aristolochia gigantea, the Brazilian Dutchman's pipe or giant pelican flower, an ornamental plant species
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Agathia gigantea, a moth species found in Java, Sumatra, Peninsular Malaysia and Borneo
Epipactis gigantea, the stream orchid or giant helleborine, an orchid species
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Edwardsina gigantea, the giant torrent midge, a fly species endemic to Australia
Myristica gigantea, a plant species found in Indonesia and Malaysia
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Megateuthis gigantea, the largest known belemnite species found in Europe and Asia
Rosa gigantea, a rose species native to northeast India, northern Myanmar and southwest China
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Rhynchostylis gigantea, an orchid species found in Myanamar and Thailand