The term red tail may refer to the following animals:

• Red-tailed hawk (Buteo jamaicensis), a North American bird of prey
• Red-tailed boa (Boa constrictor), a Central American snake
• Red-tailed Barbel (Barbus haasi), a European barbel
• Redtail catfish (Phractocephalus hemioliopterus), a South American freshwater fish
• Red-tailed black shark or Red-tailed shark (Epalzeorhynchos bicolor), a common aquarium freshwater fish native to Thailand
• Redtail barb (Enteromius gurneyi), a freshwater fish from South Africa
• Red tailed tinfoil barb (Barbonymus altus), a freshwater fish from Southeast Asia
• Red-tailed black cockatoo (Calyptorhynchus banksii), a cockatoo native to Australia
• Red-tailed tropicbird (Phaëthon rubricauda), a seabird
• Red-tailed sportive lemur (Lepilemur ruficaudatus), a primate native to Madagascar
• Redtail (Ceriagrion aeruginosum) a species of damselfly found in south-eastern Australia

The term may also refer to:

• Redtailing, following a fellow snowboarder too closely.
• Redtail, a CRM designed exclusively for financial professionals
• Redtail Nature Awareness, a nature based camp in Pictou County, Nova Scotia, Canada
• A member of the Tuskegee Airmen (the popular name for the 332d Fighter Group), a unit of African American fighter pilots during World War II
  • Red Tails, a 2012 movie
  • Red Tail Project
• Redtail, a cat from Erin Hunter's Warriors series
• Redtail Telematics Corporation, a manufacturer and distributor of GPS tracking equipment.
• A nickname for Northwest Airlines