Stephanie Caroline March (born ()July 23, 1974) is an American actress. She is best known for her role as Alexandra Cabot in the long-running NBC series, Law & Order: Special Victims Unit.
March was born in Dallas, Texas, the daughter of John and Laura March, and has a sister, Charlotte. She attended McCulloch Middle School in Highland Park, and Highland Park High School, where Law & Order's Angie Harmon, who also played the role of an assistant district attorney on Law & Order: Special Victims Unit attended concurrently. After her parents' divorce, her mother married Robert Derby. In 1996, March graduated from Northwestern University, where she was a member of Kappa Alpha Theta sorority.
At Northwestern University, she played Helena in A Midsummer Night's Dream in Chicago, where she continued to pursue her stage career. In 1997, she made her screen debut in an episode of CBS series, Early Edition. In 1999, March moved to New York and made her Broadway debut in the highly acclaimed production of Arthur Miller's Death of a Salesman, opposite Brian Dennehy. She later co-starred in the television film Death of a Salesman, based on the play. In 2000, she also performed in the Broadway premiere of Eric Bogosian's Talk Radio, starring Liev Schreiber, in 2007. She also starred in Howard Korder's Boy's Life alongside Jason Biggs.