Peacekeeper is a person involved in peacekeeping.

• UN peacekeeping

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Peacekeeper and Peacemaker are the names given to several types of strategic weapons due to their supposed ability to prevent war.

• LG-118A Peacekeeper missile (MX)
• Convair B-36 bomber ("Peacemaker")

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• The Peacekeepers are an organization in the Farscape science fiction drama.