Helen Siff
- Birthday: 1937-01-01
- Deathday: 2025-12-18
- Place of birth: Woodmere, Long Island, New York, USA
- Also know as: Helen J. Siff
Helen Siff (June 2, 1937 – December 18, 2025) was an American character actress. She was known for roles in numerous films including The Karate Kid (1984), You Don't Mess with the Zohan (2008), and Hail, Caesar! (2016). She was born in Woodmere, New York, on June 2, 1937. She died from complications of surgery in Los Angeles on December 18, 2025, at the age of 88.
