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Mary McCormack

Acting · Born February 8, 1969 · 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).

Movies with Mary McCormack

• Deep Impact (1998) — Andrea Baker
• Miracle on 34th Street (1994) — Myrna Foy
• 1408 (2007) — Lilly Enslin
• K-PAX (2001) — Rachel Powell
• True Crime (1999) — Michelle Ziegler
• Vicious (2025) — Mother
• 54 (1998) — New Year's Eve Wife (uncredited)
• Full Frontal (2002) — Linda
• Mystery, Alaska (1999) — Donna Biebe
• Drone (2017) — Ellen
• Fathers' Day (1997) — Virginia Farrell (uncredited)
• Gun Shy (2000) — Gloria Nesstra

TV shows with Mary McCormack

• The West Wing (1999) — Kate Harper
• ER (1994) — Debbie
• 25 Words or Less (2018) — Self
• In Plain Sight (2008) — Mary Shannon
• House of Lies (2012) — Denna Altshuler
• Murder One (1995) — Justine Appleton
• Heels (2021) — Willie Day
• K Street (2003) — Maggie Morris