Title: The West Wing (season 1)
Content: Janel Moloney as Donna Moss, assistant to Josh Lyman (22 episodes) ; Nicole Robinson as Margaret Hooper, Assistant to Chief of Staff McGarry (18 episodes) ; Kathryn Joosten as Dolores Landingham, President Bartlet's executive secretary (17 episodes) ; Timothy Busfield as Danny Concannon, senior White House correspondent for The Washington Post (14 episodes) ; Elisabeth Moss as Zoey Bartlet, the third and youngest of the President's daughters (7 episodes) ; Allison Smith as Mallory O'Brien, Leo McGarry's daughter (5 episodes) ; John Amos as Admiral Percy Fitzwallace, Chairman of the Joint Chiefs of Staff (5 episodes) ; Tim Matheson as John Hoynes, Vice President of the United States (5 episodes) ; Lisa Edelstein as Laurie, law student and part-time high priced call girl Sam sleeps with in the pilot (5 episodes) ; Jorja Fox as Gina Toscano, the Secret Service agent assigned to Zoey (5 episodes) ; Marlee Matlin as Joey Lucas, a Democratic political consultant (4 episodes) ; Stockard Channing as Abbey Bartlet, First Lady of the United States (3 episodes) ; Kathleen York as Andrea Wyatt, Congresswoman from Maryland's 5th district and ex-wife of Toby Ziegler (3 episodes) 
Title: Donna Moss
Content:  Donnatella "Donna" Moss  is a fictional character played by Janel Moloney on the television serial drama The West Wing. During most of the series, Donna works for White House Deputy Chief of Staff Josh Lyman as a senior assistant (or, as she jokingly calls herself in one episode, the "deputy deputy chief of staff"), until she quits her job to work for the presidential campaign of Bob Russell in season 6. Although all the senior staffs' assistants are continuing characters with personal backgrounds, Donna is the best defined and most often featured staff member on the assistant level, and her difficult, semi-romantic relationship with Josh is a recurring plotline throughout the show. She later works for Bob Russell's campaign for President as a spokeswoman, taking the same job for Matt Santos's campaign after Russell loses the primary.
Title: Donna Moss
Content:  Entertainment Weekly described Donna as "undoubtedly one of The West Wing's most indelible characters." The Atlantic ranked Donna as 39th on their list of every character in The West Wing, describing her as "Easily the most controversial of the core cast members not named 'Mandy.'" The Washington Post focuses on Donna's romantic tension with Josh Lyman, writing that while Josh and Donna's relationship was perceived as positively romantic in the time it was released, viewing the show after the Me Too movement soured the story. They named it "The Donna Problem"–that society and culture have moved on from what was acceptable a short while ago, and that well-written shows can still be relics of that older time.
Title: Janel Moloney
Content:  Janel Wallace Moloney is an American actress. She is best known for her role as Donna Moss on the television series The West Wing, a role for which she received nominations for Primetime Emmy Award for Outstanding Supporting Actress in a Drama Series in 2002 and 2004. From 2014 to 2017, she starred on the HBO drama The Leftovers.
Title: The West Wing (season 6)
Content: Alan Alda as Arnold Vinick ; Stockard Channing as Abbey Bartlet ; Dulé Hill as Charlie Young ; Allison Janney as C. J. Cregg ; Joshua Malina as Will Bailey ; Mary McCormack as Kate Harper ; Janel Moloney as Donna Moss ; Richard Schiff as Toby Ziegler ; John Spencer as Leo McGarry ; Bradley Whitford as Josh Lyman ; Jimmy Smits as Matt Santos ; Martin Sheen as Josiah Bartlet 
Title: List of The West Wing characters
Content: Aunt Barbara: Aunt from Wisconsin whom Donna leads on private tour. (Season 5) ; Uncle Ted: Uncle from Wisconsin whom Donna leads on private tour. (Season 5) ; Cousins in Oklahoma: Mentioned in "Disaster Relief" (Season 5) ; Mother: Comes to visit when Donna is hospitalized in Germany after the Gaza attack. 
Title: The West Wing (season 7)
Content: Alan Alda as Arnold Vinick ; Stockard Channing as Abbey Bartlet ; Kristin Chenoweth as Annabeth Schott ; Dulé Hill as Charlie Young ; Allison Janney as C. J. Cregg ; Joshua Malina as Will Bailey ; Mary McCormack as Kate Harper ; Janel Moloney as Donna Moss ; Richard Schiff as Toby Ziegler ; John Spencer as Leo McGarry ; Bradley Whitford as Josh Lyman ; Jimmy Smits as Matt Santos ; Martin Sheen as Josiah Bartlet 
Title: List of The West Wing characters
Content:  The television series The West Wing is a political drama series which was originally broadcast on NBC. During its seven seasons, the ensemble cast of stars, recurring stars and guest stars earned 157 acting nominations (often competing in the same category against other members of the cast) across a variety of award-granting organizations, earning 30 awards. Many actors noted for work in sitcoms appeared in dramatic roles on The West Wing, including John Goodman, Alan Alda, John Larroquette, Christopher Lloyd, Ed O'Neill, Matthew Perry, Patricia Richardson, Lily Tomlin, Wayne Wilderson and Daniel von Bargen.
Title: Janel Moloney
Content:  Her early work included television guest roles on ER, Sports Night, The Adventures of Brisco County, Jr., and Murder, She Wrote. Starting in 1999, Moloney had a recurring role on The West Wing as Donna Moss, assistant and eventual love interest to Deputy White House Chief of Staff Josh Lyman (Bradley Whitford). Moloney was originally credited only as a guest star, but she appeared in every episode of the first season. From the second season onward, Moloney was listed in the main credits. Moloney has received two Emmy Award nominations, one in 2002 and one in 2004, for Outstanding Supporting Actress in a Drama. Moloney appeared in the television film Bang Bang You're Dead with Thomas Cavanagh and Randy Harrison, which was first broadcast on October 
Title: The West Wing (season 5)
Content: Stockard Channing as Abbey Bartlet ; Dulé Hill as Charlie Young ; Allison Janney as C. J. Cregg ; Joshua Malina as Will Bailey ; Janel Moloney as Donna Moss ; Richard Schiff as Toby Ziegler ; John Spencer as Leo McGarry ; Bradley Whitford as Josh Lyman ; Martin Sheen as Josiah Bartlet 

Question: who played donna on west wing?
Answer: Catherine Tate.