Rat tail or rat's tail may refer to:
- The tail of a rat
- Rat-tailed maggot, a maggot with the tail of a rat
- Rattail, fish of the family Macrouridae
- Rattail (casting), a defect in metal casting
- Rattail (haircut)
- Rattail skate (Dipturus lanceorostratus), a fish endemic to Mozambique
- Rat-tail splice, a type of electrical splice
- Babiana ringens, a flowering plant of South Africa
- Raphanus caudatus or rattail radish
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