The One Piece universe follows the story of Monkey D. Luffy, a pirate with a goal to find the One Piece and become the next King of the Pirates. The series follows a lengthy journey of a pirate filled with adventures, as well as a vast variety of characters and distant lands. Wherever the Straw Hat Pirates crew go, they meet various individuals, friends, and foes, who come from various backgrounds and occupations.
With a vast cast of characters, there are bound to be organizations focusing on goals, like the Marines dedicated to stopping the pirates dead in their tracks. In many instances, various organizations join forces for a common goal or mutual benefit. An example of such an alliance would be the Seven Warlords of the Sea, which was formed to maintain the balance of power between the Emperors of the Sea and the Marines.
Here is a list of all the major organizations that have been introduced in the series so far:
So far, we have been introduced to these major organizations over the years. As the story progresses, the series may introduce more of such formidable organizations. Stay tuned for future updates.