Mikasa Ackerman is a fictional character from Hajime Isayama's manga series Attack on Titan. Mikasa is introduced as a citizen of Paradis Island living with the protagonist, Eren Yeager, and his family, who took her in following the deaths of her parents in an attempted kidnapping. When giant creatures known as Titans invade the area and eat Eren's mother, Mikasa and Eren become members of the Military and join the Survey Corps—an elite group of soldiers who fight Titans outside the walls and also study the physiology of Titans in order to know what they are fighting. Mikasa's main motivation for fighting is her love for Eren, of whom she is extremely protective. She has also appeared in video games and the anime adaptation.

Attack on Titan is a Japanese manga series written and illustrated by Hajime Isayama. It is set in a world where humanity is forced to live in cities surrounded by three enormous walls that protect them from gigantic man-eating humanoids referred to as Titans; the story follows Eren Yeager, who vows to exterminate the Titans after they bring about the destruction of his hometown and the death of his mother. It was serialized in Kodansha's monthly magazine Bessatsu Shōnen Magazine from September 2009 to April 2021, with its chapters collected in 34 tankōbon volumes.