Mary McCormack
Known for Acting · 77 credits
- Born
- 1969-02-08 (age 57)
- Place of birth
- Plainfield, New Jersey, USA
- Also known as
- Mary Catherine McCormack · مری مککورمک
Biography
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).
Known For
TV Shows (35)
Law & Order
1990
as Rickie the Bartender
Watch What Happens Live with Andy Cohen
2009
as Self - Guest
Law & Order: Criminal Intent
2001
as Mary Shannon
ER
1994
as Debbie
The West Wing
1999
as Kate Harper
The Pitt
2025
as Dr. Linda Conley
The Late Late Show with Craig Ferguson
2005
as Self
Scandal
2012
as Lisa Elliot
Jimmy Kimmel Live!
2003
as Self
Tony Awards
1956
as Self - Nominee
The Ellen DeGeneres Show
2003
as Self
The Tonight Show with Jay Leno
1992
25 Words or Less
2018
as Self / Mary McCormack
The Newsroom
2012
as Molly Levy
In Plain Sight
2008
as Mary Shannon
Chelsea
2016
as Self
Angie Tribeca
2016
as Abigail Liukin
To Tell the Truth
2016
as Self - Panelist
Late Night with Jimmy Fallon
2009
as Self
Murder One
1995
as Justine Appleton
Match Game
2016
as Self - Panelist
Will & Grace
2017
as Janet
House of Lies
2012
as Denna Altshuler
The Late Late Show with Craig Kilborn
1999
as Self - Guest
For the People
2018
as Chloe Daniels
Divorce
2016
as Kathy DeSantis
The L Word: Generation Q
2019
as Anne Finley
Heels
2021
as Willie Day
The Kids Are Alright
2018
as Peggy Cleary
Traffic
2004
as Carole McKay
K Street
2003
as Maggie Morris
Welcome to the Family
2013
as Caroline Yoder
The Wright Verdicts
1995
as Beth Eckhart
Loaded
2017
as Casey
Chelsea Does
2016
as Herself
Movies (42)
Deep Impact
1998
as Andrea Baker
1408
2007
as Lilly Enslin
K-PAX
2001
as Rachel Powell
Vicious
2025
as Mother
For Your Consideration
2006
as Pilgrim Woman
54
1998
as New Year's Eve Wife (uncredited)
Miracle on 34th Street
1994
as Myrna Foy
Unpregnant
2020
as Debra Clarke
Drone
2017
as Ellen
True Crime
1999
as Michelle Ziegler
Mystery, Alaska
1999
as Donna Biebe
The Crash
2017
as Sarah Schwab
Fathers' Day
1997
as Virginia Farrell (uncredited)
Gun Shy
2000
as Gloria Nesstra
Private Parts
1997
as Alison Stern
The Alarmist
1998
as Sally
Other Voices
2000
as Anna
The Broken Hearts Club: A Romantic Comedy
2000
as Anne
Scooby-Doo! WrestleMania Mystery
2014
as Ms. Richards (voice)
Full Frontal
2002
as Linda
Treehouse
2019
as Lilith
Dickie Roberts: Former Child Star
2003
as Grace Finney
Escape from Polygamy
2013
as Leann
Colin Fitz
1997
as Moira
Madison
2005
as Bonnie McCormick
Still Laugh-In: The Stars Celebrate
2019
as Self
High Heels and Low Lifes
2001
as Frances
Backfire!
1995
as Sarah
Harvest
1999
as Agent Becka Anslinger
Right at Your Door
2006
as Lexi
The Big Tease
1999
as Monique
National Memorial Day Concert
2023
as Self
Alien Code
2017
as Rebecca
The Unprofessional
2012
as Hilary Pfeiffer-Dunne
East of A
2000
as Daphne
World Traveler
2002
as Margaret
Getting to Know You
1999
as Leila Lee
BigLove
2001
as Phoebe
Should've Been Romeo
2012
as Ellen
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
2016
as Kay Larkin
A Country Called Home
2016
as Amanda
Murder One: Diary of a Serial Killer
1997
as Justine Appleton
About Mary McCormack
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). With 77 credits spanning from 1956 to 2025, Mary McCormack has appeared in 42 films and 35 TV shows.
Fans searching for Mary McCormack movies, Mary McCormack filmography, or the latest projects starring Mary McCormack can stream many of these titles on CineFlixo, free and in HD, with no subscription required.
Most Popular Mary McCormack Movies
- Deep Impact (1998) — as Andrea Baker
- 1408 (2007) — as Lilly Enslin
- K-PAX (2001) — as Rachel Powell
- Vicious (2025) — as Mother
- For Your Consideration (2006) — as Pilgrim Woman
Where to Watch Mary McCormack Films
Most Mary McCormack movies and series are available to stream on CineFlixo in full HD, completely free and without signup. Browse the complete filmography above to jump directly to any title. For more films and the latest web series featuring Mary McCormack, check our movies catalogue and browse page.