The terms horse tail, horsetail or horse's tail may refer to the following:
- The tail of a horse
- Equisetidae, the subclass that includes all living and extinct horsetails and their immediate relatives
- Equisetales, the order that includes extinct species known in the fossil record
- Equisetum, a genus in the Equisetales that includes:
- Hippuris, a flowering plant more commonly called the mare's tail
- In human anatomy, a bundle of lumbar nerves known as the cauda equina ("horse's tail")
- A horsetail is also a type of waterfall
- Tugh, a standard of horsetails used by Mongol and Turkic peoples
- Ponytail, a human hairstyle
| This disambiguation page lists articles associated with the title Horse tail.
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