The Adventures of Philip Marlowe was a hard-boiled detective radio series featuring Raymond Chandler's private eye character, Philip Marlowe. First airing on NBC on June 17, 1947, the show starred Van Heflin as Marlowe and was a summer replacement for Bob Hope. The series moved to CBS in 1948 with Gerald Mohr as Marlowe, garnering the largest audience in radio by 1949. The CBS version ran until September 29, 1950, with a short summer run in 1951. Notably, the program had no sponsor for most of its time on the air.

Philip Marlowe was a more complex, cultured, and ethical detective compared to other hardboiled detectives of the time. Marlowe was portrayed by actors such as Dick Powell, Robert Mitchum, and Humphrey Bogart in movies, as well as Van Heflin and Gerald Mohr in radio adaptations. The show's writing often featured sarcastic narration and was highly acclaimed, especially the CBS version, which was more widely received than the NBC adaptation.