'Long-tailed' may refer to:
Ichthyology
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Long-tailed river stingray, freshwater stingray
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Long-tailed thresher shark, thresher shark inhabiting tropical and temperate waters worldwide
Mammology
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Greater Long-tailed Hamster, major crop-eating rodent that resides in Northern China
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Little Long-tailed Dunnart, dunnart that was described in 1984
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Long-tailed Climbing Mouse, ''Rhipidomys mastacalis'', rodent species from South America
★ Long-tailed Climbing Mouse, ''
Vandeleuria'', rodent genus
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Long-tailed Dunnart, Australian dunnart that has a tail longer than its body
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Long-tailed Mouse, native Australian rodent
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Long-tailed Planigale, the smallest of all marsupials
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Long-tailed Pygmy Possum, diprotodont marsupial found in the rainforests of northern Australia, Indonesia and New Guinea
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Long-tailed Shrew, small North American shrew found in Atlantic Canada and the north-eastern United States
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Long-tailed Spiny Rat, spiny rat species from South America
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Long-tailed Tree Rat, spiny rat species from South America
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Long-tailed Vole, small vole found in western North America
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Long-tailed Weasel, the most widely distributed mustelid in the New World
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New Zealand Long-tailed Bat, aerial insectivore
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Nicobar Long-tailed Macaque, subspecies of the Crab-eating Macaque
Ornithology
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Long-tailed Broadbill, species of broadbill that is found in the Himalayas, Southeast Asia, and Indonesia
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Long-tailed Cormorant, member of the cormorant family of seabirds
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Long-tailed Duck, medium-sized sea duck
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Long-tailed Glossy Starling, member of the starling family of birds
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Long-tailed Hawk, bird of prey in the family Accipitridae
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Long-tailed Hermit, large hummingbird that is a resident breeder in Venezuela, the Guianas, and northern Brazil
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Long-tailed Paradigalla, large black bird of paradise
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Long-tailed Parakeet, parrot of Southeast Asia
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Long-tailed Shrike, member of the bird family Laniidae
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Long-tailed Silky-flycatcher, passerine bird which occurs only in the mountains of Costa Rica and western Panama
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Long-tailed Skua, seabird in the skua family Stercorariidae
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Long-tailed Tit, very small passerine bird
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Long-tailed tits, group of small passerine birds with medium to long tails
Other
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Long-tailed pair, common design in electronics for implementing a differential amplifier
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Long-tailed Skipper, spread-winged skipper butterfly found throughout tropical America and into the southern part of the United States