Maura Therese Tierney (born February 3, 1965) is an American film and television actress. She is best known for her roles as Lisa Miller on the critically-acclaimed 1990s situation comedy NewsRadio and as Abby Lockhart on the long-running medical drama ER.

After appearing in several plays, she moved to Los Angeles, California and in 1987 got her first break in a role in Walt Disney's made-for-TV film Student Exchange. Tierney's first starring role in a film was in a low-budget, independently-produced film called Dead Women in Lingerie, shot in 24 days. The film, a thriller with opening and closing credits paying tribute to illegal immigrants post-1986, never received a theatrical release, though it was released on DVD in 2005.

Tierney continued winning small roles in film and television, though it was not until her leading role in NewsRadio from 1995–1999 that she received regular national exposure. While a NewsRadio cast member she also appeared in two ~$100 million films (Primal Fear and Forces of Nature), and the even more successful Jim Carrey film Liar Liar.