Anna Williams (アンナ・ウィリアムズ An'na Wiriamuzu) is a character in the Tekken series.

She was introduced in the first Tekken game as the younger sister of Nina Williams, and has returned in almost every subsequent game (with the exception of Tekken 4). She is an assassin trained in various martial arts, and almost always appears in her trademark red silk dress and/or a blue version of it.

Alongside her sister, Nina Williams, Anna was taught assassination arts by her father and Aikido by her mother. Anna developed a deadly rivalry with Nina, and the two would often attempt to humiliate or kill one another.

Anna was heartbroken and exhausted by the endless fighting with her sister following her defeat at the sixth tournament. One of G Corp's elite soldiers comforted her during this time. Anna eventually fell in love and decided to marry him. Unfortunately, her fiancé was a mafia executive with enemies that wanted him killed.

On the day of their wedding, Anna realized her dress was missing as she was preparing for the ceremony. Moments later, shots rang out from the ceremony hall. Anna rushed to the scene to find her fiancé dead from a gunshot wound. She spotted Nina, the assassin hired to kill her fiancé, fleeing in her stolen wedding dress, and swore to take revenge.

Anna takes cues from the femme fatale trope, matching her deadly occupation with her histrionic, flirtatious, and sociable personality. These traits contrast with Nina's cold, more reserved demeanor. Anna also appears to value connection with other people more than Nina does, as can be observed in the relationship she entered with her fiancé in her Tekken 7 storyline, and in her willingness to help Nina following the loss of her memories during cryosleep. Anna is occasionally shown to have reservations over she and Nina's deadly rivalry, going so far as to step away from it entirely between the events of Tekken 6 and Tekken 7. Anna is shown losing to Nina in almost all of her endings except Tekken Tag Tournament 2, and this trend appears to have taken its toll following the King of Iron Fist Tournament 6, where Nina beat her both in a match and popularity rankings, leaving Anna distressed and exhausted by the repetitive cycle.