Calling All Cars was a pioneering old-time radio police drama that aired from November 29, 1933, to September 8, 1939, on CBS West Coast and the Mutual-Don Lee networks. Created by writer-director William N Robson, the show featured true crime stories from the Los Angeles Police Department, showcasing how each case was solved and justice served. Sgt. Jesse Rosenquist, a police dispatcher, was part of the entire series run.

The show was sponsored by the Rio Grande Oil Company and featured introductory remarks by officers of the Los Angeles Police Department. As a precursor to future police dramas, such as Dragnet, Calling All Cars helped improve law enforcement's public image by portraying them as dedicated public servants. The series later found syndication through different sponsors across the United States, further expanding its reach and influence on the radio drama genre.