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Katherine Burton (born September 10, 1957) is a Welsh and American actress, the daughter of actors Richard Burton and Sybil Christopher. On television, Burton received critical acclaim as Ellis Grey in the drama series Grey's Anatomy, and as Vice President Sally Langston on Scandal. She has been nominated for three Primetime Emmy Awards and three Tony Awards.
| Year | Title | Role | Notes |
| 1969 | Anne of the Thousand Days | Serving Maid | Uncredited |
| 1986 | Big Trouble in Little China | Margo Litzenberger | |
| 1993 | Life with Mikey | Mrs. Burns | |
| 1996 | August | Helen Blathwaite | |
| 1996 | The First Wives Club | Woman in Bed | |
| 1997 | The Ice Storm | Dorothy Franklin | |
| 1998 | Celebrity | Cheryl | |
| 2000 | The Opportunists | Rest Home Sister | |
| 2002 | Unfaithful | Tracy | |
| 2002 | Swimfan | Carla Cronin | |
| 2003 | The Paper Mache Chase | Martha | Short film |
| 2005 | Stay | Mrs. Letham | |
| 2006 | Sherrybaby | Marcia Swanson | |
| 2007 | Lovely by Surprise | Helen | |
| 2008 | What Just Happened | Dr. Randall | |
| 2008 | Quid Pro Quo | Merilee | |
| 2008 | Max Payne | Nicole Horne | |
| 2009 | The Kings of Appletown | Aunt Birdy | |
| 2009 | Spooner | Alice Spooner | |
| 2010 | Remember Me | Janine | |
| 2010 | Consent | Susan | |
| 2010 | 127 Hours | Aron's Mom | |
| 2011 | Puncture | Senator O'Reilly | |
| 2012 | Liberal Arts | Susan | |
| 2012 | 2 Days in New York | Bella | |
| 2012 | Mariachi Gringo | Anne | |
| 2014 | Barefoot | Mrs. Wheeler | |
| 2015 | Bleeding Heart | Martha | |
| 2015 | Martyrs | Eleanor | |
| 2015 | Amok | Dr. Wilson | |
| 2019 | Where'd You Go, Bernadette | Ellen Idelson | |
| 2022 | Breaking | Tami Stackhouse | |
| 2023 | Our Son | Maggie | |
| 2023 | The Anne Frank Gift Shop | Ilse | Short film |
| 2023 | Dumb Money | Elaine Gill | |
| 2024 | Guts | Gabby | Short film |
| 2025 | The Surrender | Barbara | |
| 2025 | Violent Ends | Darlene Woodley |
| Year | Title | Role | Notes |
| 1983, 2017 | Great Performances | Alice / Liz Essendine | 2 episodes |
| 1984 | Ellis Island | Vanessa Ogden | Miniseries3 episodes |
| 1985 | Evergreen | Agatha Bradford | Episode: "1.2" |
| 1987 | Uncle Tom's Cabin | Ophelia | Television film |
| 1987–1988 | Spenser: For Hire | Randy Lofficier | 2 episodes |
| 1988 | American Playhouse | Agnes Bolton O'Neill | Episode: "Journey Into Genius" |
| 1992 | Law & Order | Sister Bettina | Episode: "Sisters of Mercy" |
| 1992 | Home Fires | Anne Kramer | 6 episodes |
| 1993 | Brooklyn Bridge | Susan Lowenberg Jones | Episode: "Keeping Up with the Joneses" |
| 1993 | Love Matters | Deborah | Television film |
| 1994 | Monty | Fran Richardson | 13 episodes |
| 1994 | All My Children | Dr. Renee Peters | Unknown episodes |
| 1995 | ABC Afterschool Special | Brenda Gardner | Episode: "Notes for My Daughter"Daytime Emmy Award for Outstanding Performer in a Children's Special |
| 1996 | Mistrial | Katherine Donohue | Television film |
| 1997 | Ellen Foster | Abigail Montford | Television film |
| 1997–2004 | The Practice | Susan Alexander | 9 episodes |
| 2001–2009 | Law & Order | Erica Gardner | 4 episodes |
| 2001 | 100 Centre Street | Sheila Byrne | Episode: "My Brother's Keeper" |
| 2001 | Law & Order: Criminal Intent | Stephanie Uffland | Episode: "The Pardoner's Tale" |
| 2002 | Obsessed | Sara Miller | Television film |
| 2003 | The Diary of Ellen Rimbauer | Connie Posey | Television film |
| 2004 | The West Wing | Sarah Brainerd | Episode: "Slow News Day" |
| 2005 | Judging Amy | Dr. Sheri Jordan | Episode: "Silent Era" |
| 2005 | Empire Falls | Cindy Whiting | 2 episodes |
| 2005 | American Masters | Voice of Novels | Episode: "Ernest Hemingway: Rivers to the Sea" |
| 2005 | Numb3rs | Anthropologist | Episode: "Bones of Contention" |
| 2005–2006 | Rescue Me | Rose | 6 episodes |
| 2005–present | Grey's Anatomy | Ellis Grey | 26 episodesNominated—Primetime Emmy Award for Outstanding Guest Actress in a Drama Series (2006–07) |
| 2006 | Justice | Sarah Miller | Episode: "Death Spiral" |
| 2007 | Supreme Courtships | Justice Suzanne Mary Lynch | Unsold TV pilot |
| 2008 | Medium | Bonnie Barrister | Episode: "To Have and to Hold" |
| 2009 | Eleventh Hour | Gepetto / Miranda Cochran | Episode: "Pinocchio" |
| 2009 | Washingtonienne | Joy | Episode: "Pilot" |
| 2009–2012 | The Good Wife | Victoria Adler | 3 episodes |
| 2010 | The Deep End | Grace Graham | Episode: "Pilot" |
| 2011 | Law & Order: Special Victims Unit | Annette Cole | Episode: "Bully" |
| 2011 | Criminal Minds: Suspect Behavior | Deirdre Norris | Episode: "Smother" |
| 2011 | The Closer | Kate Wycoff | Episode: "Forgive Us Our Trespasses" |
| 2011–2017 | Grimm | Marie Kessler | 3 episodes |
| 2012 | Made in Jersey | Lorraine Beckett | Episode: "Cacti" |
| 2012–2017 | Veep | Barbara Hallowes | 3 episodes |
| 2012–2018 | Scandal | Vice President Sally Langston | 42 episodesNominated—Primetime Emmy Award for Outstanding Guest Actress in a Drama Series (2014) |
| 2013 | Revolution | Dr. Jane Warren | Episode: "The Night the Lights Went Out in Georgia" |
| 2013 | Live from Lincoln Center | Mrs. Mullin | Episode: "The New York Philharmonic's Performance of Rodgers & Hammerstein's Carousel" |
| 2014 | Rake | Holly Phillips | Episode: "Hey, Good Looking" |
| 2015 | Full Circle | Vera Quinn | 5 episodes |
| 2015 | Key & Peele | Hillary Clinton | Episode: "Y'all Ready for This?" |
| 2015 | Extant | Fiona Stanton | 6 episodes |
| 2016 | Elementary | Maureen Dannon | Episode: "Down Where the Dead Delight" |
| Award | Year | Category | Work | Result | Ref. |
| 1983 | Theater World Awards | Alice in Wonderland, Present Laughter and Winners | Won | ||
| 1990 | Drama Desk Awards | Outstanding Featured Actress in a Play | Some Americans Abroad | Nominated | |
| 1996 | Daytime Emmy Awards | Outstanding Performer in a Children's Special | Notes for My Daughter, ABC Afterschool Special | Won | |
| 2002 | Tony Awards | Best Featured Actress in a Play | The Elephant Man | Nominated | |
| Best Actress in a Play | Hedda Gabler | Nominated | |||
| 2006 | The Constant Wife | Nominated | |||
| Primetime Emmy Awards | Outstanding Guest Actress in a Drama Series | Grey's Anatomy | Nominated | ||
| 2007 | Nominated | ||||
| 2014 | Scandal | Nominated | |||