Sybil (played by Sally Field) is a protagonist in Sybil.
Young woman suffering from severe dissociative identity disorder, central to psychological drama. Dr. Cornelia Wilbur (played by Joanne Woodward) is a protagonist in Sybil.
Dedicated psychiatrist who treats Sybil's complex psychological trauma with patience. Richard (played by Brad Davis) appears in Sybil.
Supporting character in Sybil's life, representing her social connections. Hattie (played by Martine Bartlett) appears in Sybil.
Family acquaintance or relative involved in Sybil's upbringing. Frieda Dorsett (played by Jane Hoffman) appears in Sybil.
Abusive mother figure contributing to Sybil's psychological trauma. Dr. Quinoness (played by Charles Lane) appears in Sybil.
Medical professional involved in Sybil's treatment. Grandma Dorsett (played by Jessamine Milner) appears in Sybil.
Elderly family member in Sybil's lineage. Willard Dorsett (played by William Prince) appears in Sybil.
Family patriarch involved in Sybil's upbringing.