Which actress played Donna Moss?

Janel Moloney played Donna Moss on The West Wing. Donna is the senior assistant to Deputy White House Chief of Staff Josh Lyman, played by Bradley Whitford, and her quick exchanges with Josh become one of the series’ most recognizable recurring relationships.

Moloney originally joined the show as a guest performer. Donna had only a few lines in the pilot script, but Moloney’s chemistry with Whitford and the rest of the cast helped expand the character. Although she was initially credited as a guest star, she appeared in every episode of season 1 and became part of the main cast from season 2 onward.

Donna’s story develops well beyond her job as Josh’s assistant. In season 6, she leaves the White House to work for Bob Russell’s presidential campaign, later joins Matt Santos’s campaign, and eventually becomes Chief of Staff to the First Lady.

The other options are actors or characters from the same series: Allison Janney played C.J. Cregg, Dulé Hill played Charlie Young, and Melissa Fitzgerald played Carol Fitzpatrick. None played Donna Moss.