Hammer or Hammerhead could refer to:
- Implements
- People
- Mike Hammer, a fictional detective
- Hammersmith, the CO of Starbase 29
- Starships
- USS Hammer, a Federation destroyer starship
- USS Hammerhead, a Charger-class starship
- Morjod's Hammer, a Klingon robot drone ship
- Other topics
- hammerhead, a species of shark
- hammerhead stall, an acrobatic aircraft maneuver
- Strike Team Hammerhead, a MACO force aboard the Enterprise NX-01
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