Anna Williams is a character from the Tekken franchise of fighting games. She is the younger sister of Nina Williams and they both greatly dislike each other. When their father, Richard Williams, died, both sisters blamed each other for their father's untimely death. She is in her early twenties throughout the entire game series, because after the King of Iron Fist Tournament 2, the Mishima Zaibatsu used the sisters as test subjects for experimental cryogenics research. Fifteen years later, Anna woke up with full memory of Nina, but Nina woke up with no memory of Anna, sparking Nina's assassination drive once again after 15 years.

By the time of Tekken 5, Anna feels there's something missing in her life when Nina vanished a few years earlier. She recives a phone call -- from Nina. A few days later, when the two meet eyes, a gunfight ensues that lasts for days. In the end, they agree to settle things for good at the King of Iron Fist Tournament 5.