Liev Schreiber (born October 4, 1967) is an American actor, director and screenwriter. He became known during the late 1990s and early 2000s, having initially appeared in several independent films, and later mainstream Hollywood films, including the Scream trilogy of horror films. Schreiber is also a respected stage actor, performing in several Broadway productions. In 2005, Schreiber won a Tony Award for his performance in the play Glengarry Glen Ross. That year, Schreiber also made his debut as a film director and writer with Everything Is Illuminated, based on the novel of the same name.

Schreiber is in a relationship with Naomi Watts, with whom he has two children.

Schreiber was born Isaac Liev Schreiber in San Francisco, California, the son of Heather (née Milgram) and Tell Schreiber, a stage actor and director. His father is of Austrian, Irish, Swiss and Scottish descent, and his mother is Jewish, the descendant of immigrants from Poland, Ukraine and Germany. His mother says she named him after her favorite Russian author, Leo Tolstoy, while his father claims that Schreiber was named after the doctor who saved his mother's life. His family nickname, adopted when Schreiber was a baby, is "Huggy". When Schreiber was one year old, his family moved to Canada, but at age five, due to his parents' divorce, he moved to New York City with his mother, where he grew up on the Lower East Side.