Princess Leia Organa is a fictional character in the Star Wars universe. She is portrayed by actress Carrie Fisher in A New Hope, The Empire Strikes Back, Return of the Jedi, and The Star Wars Holiday Special. Aiden Barton appeared as an infant Leia in Revenge of the Sith. Ann Sachs provided the voice of Leia in the 1980s radio dramas of the original trilogy.

She is one of the main protagonists of the original Star Wars trilogy. In Return of the Jedi, it is revealed that she is the twin sister of Luke Skywalker, and thus the daughter of Darth Vader. In the Star Wars prequel films, her mother is identified as Padmé Amidala. Her adoptive father is Bail Organa, the head of Alderaan's royal family and a supporting character in the prequels; in later Star Wars literature she marries Han Solo, her romantic interest in the original films.

By the fictional chronology, Leia first appears in Revenge of the Sith, when Padmé gives birth to her and Luke at Polis Massa. (In an apparent plothole, Leia is able to recall in Return of the Jedi- set 23 years later- that her mother was "beautiful, kind, but sad", despite the fact that Padmé dies only minutes after Leia is born.