Tipula orientalis, a crane fly species in the genus Tipula
Toussaintia orientalis, a plant species endemic to Tanzania and Kenya
Trachystemon orientalis, the Abraham-Isaac-Jacob, a perennial herb species native to eastern Europe
Tragopogon orientalis, a plant species in the genus Tragopogon
Trema orientalis, the pigeon wood, gunpowder tree or nalita, a flowering tree species found from South Africa to Tropical Africa and in warm regions of Asia
Tapiostola orientalis, a synonym for Hypocoena inquinata, the sordid wainscot or tufted sedge moth, a moth species found across Canada from Newfoundland to British Columbia, south in the east to Connecticut and Ohio and in the west to Colorado
Thuja orientalis, a synonym for Platycladus orientalis, a conifer tree species
