Tara Gregson is a fictional character from the television series United States of Tara, created by Diablo Cody. She is portrayed by actress Toni Collette and is a mother of two who struggles with dissociative identity disorder, previously known as multiple personality disorder. Tara's condition leads her to develop several distinct personalities, each with its own traits and behaviors. The show explores Tara's life as she navigates her family dynamics and the challenges of her mental health. It highlights the impact of her disorder on her relationships with her husband, Max Gregson, and their children, Kate and Marshall.