Beagle may refer to:
- A dog breed; see beagle
- HMS Beagle is the name of the ship in which Charles Darwin undertook the travels during which he made many observations which became important for his formulation of his theory of evolution.
- Beagle 2, named after HMS Beagle, is a space probe that landed on Mars on December 25 2003 to search for signs of Martian life, past or present.
- There is also a Beagle Aircraft Company