Knocking
- Taon: 2006
- Bansa: United States of America
- Genre: Documentary
- Studio: Corporation for Public Broadcasting, Open Door Productions, ITVS
- Keyword: holocaust (shoah), bible, blood transfusion, civil liberties, jehovah's witness, the watchtower
- Direktor: Joel Engardio, Tom Shepard
- Cast: Jason Edling, Seth Thomas, Joseph Kempler, Lillian Gobitas-Klose