William Brooks Ching was an American character actor who appeared in numerous films and on television during the later 1940s and 1950s. Ching may be best known for his supporting role in Rudolph Maté's 1950 film noir D.O.A. along with his role as the overbearing boyfriend of Katharine Hepburn's character in George Cukor's 1952 comedy Pat and Mike.

D.O.A. is a 1950 American film noir directed by Rudolph Maté, starring Edmond O'Brien and Pamela Britton. It is considered a classic of the genre. A fatally poisoned man tries to find out who has poisoned him and why. It was the film debuts of Beverly Garland and Laurette Luez. In 2004, D.O.A. was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant."