The Shichibukai (七武海 Shichibukai, literally meaning "Seven Military Seas"), the full title being Oka Shichibukai (王下七武海 Ōka Shichibukai, literally meaning "Royal Seven Military Seas"), are seven (reduced to four after the Battle of Marineford) powerful and well-known pirate captains who have allied themselves with the World Government. The Shichibukai is an organization of seven former pirates turned privateers in the service of the World Government. Although they work for the World Government, the Shichibukai do not care about or respect the Government (excluding Bartholomew Kuma, who was transformed into their puppet) or even other Shichibukai, and are often considered by the Marines to be no different from any other pirate. On the other hand, they are known as "government dogs" and are despised by other pirates, but are still feared and respected for their infamous reputation and strength before, and even after they become Shichibukai.

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