The gothic thriller, based on the novel by Susan Hill, will be directed by Eden Lake-helmer James Watkins and comes from a script by the brilliant Jane Goldman, who wrote Stardust and Kick-Ass and is currently hard at work on X-Men: First Class.
Radcliffe will play a young lawyer, Arthur Kipps, who finds himself in a remote part of Britain to deal with a recently deceased client's paperwork. While working in the old house he starts experiencing horrific hauntings by the ghost of a scorned woman out for vengeance.
"I am incredibly excited to be part of The Woman In Black," Radcliffe said. "Jane Goldman's script is beautifully written - both tender and terrifying in equal measure. It is thrilling to be working with James Watkins. From his brilliant work on Eden Lake and also having met him and heard his vision for the film, I know he will make a fantastic film."
Radcliffe has been the most prolific of his young Potter co-stars during the films' lengthy production cycle, having appeared on TV in My Boy Jack, stripping off on stage on Broadway and in the West End in Equus and on the big screen in Aussie indie December Boys.
This latest role suggests the 20-year-old is keen to spread his wings after ten years as the Boy Wizard. He's also attached to The Journey is the Destination, in which he'll play photojournalist Dan Eldon, and a remake of All Quiet on the Western Front.