Acting

Mary McCormack

Born 1969-02-08 · Plainfield, New Jersey, USA

Mary Catherine McCormack is an American actress. She has had leading roles as Justine Appleton on the series Murder One (1995–1997), as Deputy National Security Adviser Kate Harper on The West Wing (2004–2006), as Deputy U.S. Marshal Mary Shannon on In Plain Sight (2008–2012), and as Peggy on the comedy series The Kids Are Alright (2018–2019).

Credits

Newest first

Vicious
as Mother
2025
The Pitt
as Dr. Linda Conley
2025
National Memorial Day Concert
as Self
2023
Heels
as Willie Day
2021
Unpregnant
as Debra Clarke
2020
The L Word: Generation Q
as Anne Finley
2019
Still Laugh-In: The Stars Celebrate
as Self
2019
Treehouse
as Lilith
2019
The Kids Are Alright
as Peggy Cleary
2018
25 Words or Less
as Self
2018
25 Words or Less
2018
25 Words or Less
as Mary McCormack
2018
For the People
as Chloe Daniels
2018
Will & Grace
as Janet
2017
Drone
as Ellen
2017
Loaded
as Casey
2017
Alien Code
as Rebecca
2017
The Crash
as Sarah Schwab
2017
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
as Kay Larkin
2016
Divorce
as Kathy DeSantis
2016
Match Game
as Self - Panelist
2016
To Tell the Truth
as Self - Panelist
2016
Chelsea
as Self
2016
A Country Called Home
as Amanda
2016
Chelsea Does
as Herself
2016
Angie Tribeca
as Abigail Liukin
2016
Scooby-Doo! WrestleMania Mystery
as Ms. Richards (voice)
2014
Welcome to the Family
as Caroline Yoder
2013
Escape from Polygamy
as Leann
2013
The Newsroom
as Molly Levy
2012
Should've Been Romeo
as Ellen
2012
Scandal
as Lisa Elliot
2012
House of Lies
as Denna Altshuler
2012
The Unprofessional
as Hilary Pfeiffer-Dunne
2012
Watch What Happens Live with Andy Cohen
as Self - Guest
2009
Late Night with Jimmy Fallon
as Self
2009
In Plain Sight
as Mary Shannon
2008
1408
as Lilly Enslin
2007
For Your Consideration
as Pilgrim Woman
2006
Right at Your Door
as Lexi
2006
Madison
as Bonnie McCormick
2005
The Late Late Show with Craig Ferguson
as Self
2005
Traffic
as Carole McKay
2004
K Street
as Maggie Morris
2003
The Ellen DeGeneres Show
as Self
2003
Dickie Roberts: Former Child Star
as Grace Finney
2003
Jimmy Kimmel Live!
as Self
2003
Full Frontal
as Linda
2002
World Traveler
as Margaret
2002
K-PAX
as Rachel Powell
2001
Law & Order: Criminal Intent
as Mary Shannon
2001
High Heels and Low Lifes
as Frances
2001
BigLove
as Phoebe
2001
East of A
as Daphne
2000
Gun Shy
as Gloria Nesstra
2000
The Broken Hearts Club: A Romantic Comedy
as Anne
2000
Other Voices
as Anna
2000
The Big Tease
as Monique
1999
Mystery, Alaska
as Donna Biebe
1999
The West Wing
as Kate Harper
1999
The Late Late Show with Craig Kilborn
as Self - Guest
1999
True Crime
as Michelle Ziegler
1999
Harvest
as Agent Becka Anslinger
1999
Getting to Know You
as Leila Lee
1999
The Alarmist
as Sally
1998
54
as New Year's Eve Wife (uncredited)
1998
Deep Impact
as Andrea Baker
1998
Murder One: Diary of a Serial Killer
as Justine Appleton
1997
Fathers' Day
as Virginia Farrell (uncredited)
1997
Private Parts
as Alison Stern
1997
Colin Fitz
as Moira
1997
Murder One
as Justine Appleton
1995
The Wright Verdicts
as Beth Eckhart
1995
Backfire!
as Sarah
1995
Miracle on 34th Street
as Myrna Foy
1994
ER
as Debbie
1994
The Tonight Show with Jay Leno
1992
Law & Order
as Rickie the Bartender
1990
Tony Awards
as Self - Nominee
1956