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Tatum Beatrice O'Neal (born November 5, 1963) is an American actress. At the age of 10, she became the youngest person ever to win a competitive Academy Award, for her performance as Addie Loggins in Paper Moon co-starring her father, Ryan O'Neal. She later starred in the films The Bad News Bears, Nickelodeon, and Little Darlings, and appeared in guest roles in the television series Sex and the City, 8 Simple Rules, and Law & Order: Criminal Intent.
| Year | Title | Role | Notes |
| 1973 | Paper Moon | Addie Loggins | Academy Award for Best Supporting ActressDavid di Donatello Award for Best Foreign Actress (tied with Barbra Streisand for The Way We Were)Golden Globe Award for New Star Of The Year – ActressNominated – Golden Globe Award for Best Actress – Motion Picture Musical or Comedy |
| 1976 | The Bad News Bears | Amanda Whurlitzer | |
| Nickelodeon | Alice Forsyte | ||
| 1978 | International Velvet | Sarah Brown | |
| 1980 | Circle of Two | Sarah Norton | |
| Little Darlings | Ferris Whitney | ||
| 1982 | Prisoners | Christie | Unreleased |
| 1985 | Certain Fury | Scarlet | |
| 1992 | Little Noises | Stella | |
| 1996 | Basquiat | Cynthia Kruger | |
| 2002 | The Scoundrel's Wife | Camille Picou | US video title: The Home FrontSan Diego Film Festival Award for Best Actress |
| 2003 | The Technical Writer | Slim | |
| 2006 | My Brother | Erica | |
| 2008 | Saving Grace B. Jones | Grace B. Jones | |
| 2010 | The Runaways | Marie Harmon | |
| Last Will | Hayden Emery | ||
| 2012 | This Is 40 | Realtor | Cameo |
| 2013 | Mr. Sophistication | Kim Waters | |
| 2015 | Sweet Lorraine | Lorraine Bebee | |
| She's Funny That Way | Waitress | Cameo | |
| 2017 | Rock Paper Dead | Dr. Evelyn Bauer | |
| 2018 | God's Not Dead: A Light in Darkness | Barbara Solomon | |
| 2019 | The Assent | Dr. Hawkins | |
| 2020 | Troubled Waters | Kim Waters | |
| 2021 | Not to Forget | Doctor |
| Year | Title | Role | Notes |
| 1984 | Faerie Tale Theatre | Goldilocks | Episode: "Goldilocks and the Three Bears" |
| 1989 | CBS Schoolbreak Special | Kim | Episode: "15 and Getting Straight" |
| 1993 | Woman on the Run: The Lawrencia Bembenek Story | Laurie Bembenek | TV movie |
| 2003 | Sex and the City | Kyra | Episode: "A Woman's Right to Shoes" |
| 2004 | 8 Simple Rules | Ms. McKenna | Episode: "Opposites Attract: Part 3: Night of the Locust" |
| Law & Order: Criminal Intent | Kelly Garnett | Episode: "Semi-Detached" | |
| 2005 | Ultimate Film Fanatic | Judge | |
| 2005–2011 | Rescue Me | Maggie | Recurring role (Seasons 2–3, 5–7), Main role (Season 4); 39 episodes |
| 2006 | Dancing with the Stars | Herself | 5 episodes |
| Wicked Wicked Games | Blythe Hunter | 51 episodes | |
| 2008 | Fab Five: The Texas Cheerleader Scandal | Lorene Tippit | TV movie |
| 2010 | RuPaul's Drag Race | Herself | Episode: "The Diva Awards" |
| 2011 | Ryan and Tatum: The O'Neals | Herself | |
| 2015 | Hell's Kitchen | Herself | Episode: "6 Chefs Compete" |
| 2017 | Criminal Minds | Miranda White | Episode: "Assistance Is Futile" |
| 2018 | Runaway Romance | Veronica Adson | TV movie |