Pelorus may refer to:
- In Greek Mythology, Pelorus was one of the Spartoi
- Pelorus (instrument), a navigational instrument
- Pelorus Jack, was a dolphin
- Pelorus Sound, in the Marlborough Sounds of New Zealand
- HMS Pelorus, one of a number of Royal Navy ships
- Pelorus (yacht), one of the largest private yachts in the world, owned by Roman Abramovich
- Pelorus (Sicily), a peninsula of the island of Sicily
- Pelorus-class cruiser, a Royal Navy cruiser class
- Pelorus Research, a trading name of Holdingham Group Limited