William Arntz is an American film director and producer, best known for directing What the Bleep Do We Know?^[1]

• 1980 – Producer, Writer, Director, Beat the Deva
• 2000 – Producer, Clouds (producer)
• 2004 – Producer, Writer, Director, What the Bleep Do We Know?
• 2006 – Producer, Writer, Director, What the Bleep! Down the Rabbit Hole (extended edition of What the Bleep for DVD release)
• 2010 – Producer, Writer, Director, GhettoPhysics: Will the Real Pimps and Hos Please Stand Up