| Liam Neeson | Alfred Kinsey |
| Laura Linney | Clara McMillen |
| Chris O'Donnell | Wardell Pomeroy |
| Peter Sarsgaard | Clyde Martin |
| Timothy Hutton | Paul Gebhard |
| John Lithgow | Alfred Sequine Kinsey |
| Tim Curry | Thurman Rice |
| Oliver Platt | Herman Wells |
| Dylan Baker | Alan Gregg |
| Julianne Nicholson | Alice Martin |
| William Sadler | Kenneth Braun |
| Heather Goldenhersh | Martha Pomeroy |
| John McMartin | Huntington Hartford |
| Veronica Cartwright | Sara Kinsey |
| Kathleen Chalfant | Barbara Merkle |
| Dagmara Dominczyk | Agnes Gebhard |
| Lynn Redgrave | Cameo Appearance |
| Harley Cross | Young Man in Gay Bar |
| Romulus Linney | Rep. B. Carroll Reece |
| Katharine Houghton | Mrs. Spaulding |
| John Epperson | Effete Man in Gay Bar |
| Jefferson Mays | Effete Man's Friend |
| Jenna Gavigan | Joan Kinsey |
Zoologist Alfred Kinsey's research on human sexuality challenges the status quo of the late 1940s.
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