Count Dooku of Serenno is a Star Wars character who was a Jedi Master who fell to the dark side of the Force and became Darth Tyranus, the apprentice of Darth Sidious after Darth Maul and before Darth Vader.

Under Sidious's orders, he formed the Confederacy of Independent Systems and was the political leader of the Separatist movement.

The character, played by Christopher Lee, appeared in the films Star Wars Episode II: Attack of the Clones and Star Wars Episode III: Revenge of the Sith.