
- Liam Neeson Alfred Kinsey
- Laura Linney Clara Kinsey
- Chris O'Donnell Wardell Pomeroy
- Tim Curry Dr. Thurman Rice
- Peter Sarsgaard Clyde Martin
- Timothy Hutton Paul Gebhard
- John Lithgow Alfred Seguine Kinsey
- Oliver Platt Herman Wells
- Dylan Baker Alan Gregg
- Julianne Nicholson Alice Martin
- William Sadler Kenneth Braun
- Lynn Redgrave Entrevistadora
- David Harbour Robert Kinsey
- Kate Jennings Grant Marjorie Hartford
- Jarlath Conroy Tendero
- Jefferson Mays
- Kathleen Chalfant Barbara Merkle