How many Oscars did The Pirates of the Caribbean win?

Pirates of the Caribbean: The Curse of the Black Pearl(2003) was nominated for five Oscars: Best Actor, Sound, Sound Editing, Visual Effects and Makeup.

Pirates of the Caribbean: Dead Man's Chest (2006) won 1 of 4 nominations: Best Art Direction, Sound Editing, Sound Mixing and won Visual Effects.

Pirates of the Caribbean: At World's End (2007) was nominated for two awards: Best Visual Effects and Makeup.