Elisabeth Röhm is an American television and film actress and director. She is best known for playing Kate Lockley in the television series Angel from 1999 to 2001 and Serena Southerlyn in the television series Law & Order from 2001 to 2005.

Kate Lockley is a fictional character created by Joss Whedon for the television series called Angel. She is portrayed by Elisabeth Röhm. Lockley first appears in the episode "Lonely Heart" as a young, skeptical detective for the Los Angeles Police Department. Gradually, she becomes more hardened as she learns of the supernatural world.