Erebus is the Greek god of darkness as well as a region of the Greek underworld.

Erebus may also refer to:

• HMS Erebus, five ships of Britain's Royal Navy, most famously:
  • HMS Erebus (1826), a part of Franklin's failed expedition to find the Northwest Passage
• Erebus-class monitor, a class of Royal Navy ships
• USS Squando, briefly named Erebus (1869)

• Mount Erebus, an Antarctic volcano
• Erebus (crater), a crater on Mars
• Erebus Montes, a group of mountains on Mars

• Erebos (album), an album by Hate
• Erebus I, an extended play recording by American electronic music producer Notaker
• "Erebus", a 2004 song by The Amenta, from the album Occasus

• Erebus (moth), a genus of noctuid moths
• Erebus crystal, a type of feldspar
• Erebus Motorsport, an Australian motor racing team
• Mount Erebus disaster, a DC-10 crash on the Antarctic mountain in 1979
  • Erebus: The Aftermath, a New Zealand television miniseries about the accident