Red-tailed may refer to: In ornithology:
- Red-tailed Black Cockatoo, large cockatoo native to Australia
- Red-tailed Comet, medium-sized hummingbird found in the Andes of South America
- Red-tailed Hawk, large Buteo which breeds from western Alaska and northern Canada to Panama and the West Indies
- Red-tailed Tropicbird, seabird that nests across the Indian and Pacific Oceans
In other fields:
- Red-tailed black shark, species of freshwater fish in the carp family, Cyprinidae
- Red-tailed Boa, the second largest member of the family Boidae after the anaconda
- Red-tailed Sportive Lemur, nocturnal species feeding largely on leaves
