- Source of Wealth: Film and Television
- Age: 33
- Birth Place: Los Angeles, California, USA
- Height: 5′ 6″ (1.68 m)
- Weight: 54 kg (119 lbs)
- Marital Status: Married (Matthew Rodgers)
- Full Name: Katherine Evelyn Anita Cassidy
- Nationality: American
- Date of Birth: November 25, 1986
- Ethnicity: German, Irish, English, Swiss-German, distant Scottish and remote Welsh
- Occupation: Actress
- Education: Calabasas High School and Tisch School of the Arts
Katie Cassidy is an American actress who was born in California on November 25, 1986. Her net worth is estimated at $3 million. She came from a family of actors – both her grandparents and father were well-known actors. She has appeared in many horror films and TV shows such as Supernatural, Harper, When a Stranger Calls, and Gossip Girl, among others. In some of these films that Katie has appeared in, she was a supporting actor.