Julia OHara Stiles (born March 28, 1981) is an American stage and film actress.

After beginning her career in small parts in a New York City theatre troupe, she has moved on to leading roles in plays by writers as diverse as William Shakespeare and David Mamet. Her film career has included both commercial and critical successes, ranging from teen romantic comedies (romantic comedy) such as 10 Things I Hate About You (1999) to dark art house pictures (art film) such as The Business of Strangers (2001). She is also well known for playing the supporting character Nicky Parsons in the Bourne film series (Bourne (film series)).