Janel Moloney is an American actress, 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.

Donnatella 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, 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.