The Lion's Mouth Opens is a 2014 short documentary film. It follows actress and filmmaker Marianna Palka as she pursues testing to learn whether she inherited the genetic mutation that causes Huntington's disease, an incurable neurodegenerative disease.

Marianna Bronislawa Barbara Palka is a Scottish actress, producer, director, and writer. She is the writer, director and star of the film Good Dick, which screened at the Sundance Film Festival.