The Republic of Pirates was the base and stronghold of a loose confederacy run by privateers-turned-pirates in Nassau on New Providence island in the Bahamas during the Golden Age of Piracy for about twelve years from 1706 until 1718. While it was not a republic in a formal sense, it was governed by an informal pirate code, which dictated that the crews of the Republic would vote on the leadership of their ships and treat other pirate crews with civility. The term comes from Colin Woodard's book of the same name.

A privateer is a private person or vessel which engages in maritime warfare under a commission of war. Since robbery under arms was a common aspect of seaborne trade, until the early 19th century all merchant ships carried arms. A sovereign or delegated authority issued commissions, also referred to as letters of marque, during wartime. The commission empowered the holder to carry on all forms of hostility permissible at sea by the usages of war. This included attacking foreign vessels and taking them as prizes and taking crews prisoner for exchange. Captured ships were subject to condemnation and sale under prize law, with the proceeds divided by percentage between the privateer's sponsors, shipowners, captains and crew. A percentage share usually went to the issuer of the commission.