Quiet, Please! was a radio fantasy and horror program created by writer and director, Wyllis Cooper, who also created the famous Lights Out radio show. Airing from June 8, 1947 to June 25, 1949 on the Mutual Broadcasting System and later on ABC, the show consisted of 106 episodes featuring Ernest Chappell as its announcer and lead actor. Although the show received little recognition during its original run, it is now considered one of the finest examples of golden age American radio drama.

The series featured a variety of story genres including fantasy, horror, suspense, romance, science fiction, crime, family drama, and humor. It particularly gained a reputation for its eerie, surreal quality and well-crafted stories. Ernest Chappell's conversational narrative style and the show's meticulous attention to detail in creating convincing worlds contributed to its immersive atmosphere. Quiet, Please! also utilized meta-fictional ploys and showcased the versatility of Chappell in creating distinctive characters for each episode.

Despite never attracting a sponsor, the show received praise and gathered a loyal following during its time on air. In recent years, it has been adapted for stage and film, and a podcast discussing the series premiered in 2020.