28 March – New York City radio station WQXR (now WFME) bans singing commercials from being broadcast on its station.
30 April – (Six days before) The American Broadcasting Station in Europe (ABSIE) is established, transmitting from the United Kingdom in English, German, French, Dutch, Danish, and Norwegian to resistance movements in mainland Europe.
One day before D-Day, the BBC transmits coded messages (including the second line of a poem by Paul Verlaine) from Britain to underground resistance fighters in France warning that the invasion of Europe is about to begin.[2][3]
12 June – Fireside chat: Opening Fifth War Loan Drive (last fireside chat).
25 July – The New York Times acquires the Interstate Broadcasting Company, parent of WQXR (now WFME) and WQXQ-FM (later WQXR; frequency becomes home to WXNY-FM) from John V. L. Hogan for $1 million American dollars. The Times will program the AM station until December 1998, and own the FM station until October 2009.
10 December – Italian conductor Arturo Toscanini leads a concert performance of the first half of Beethoven's Fidelio (minus its spoken dialogue) in German on NBC Radio in the United States, starring Rose Bampton. He chooses this opera for its political message: a statement against tyranny and dictatorship, intending it as a tribute to the German people who are being oppressed by Hitler. The second half is broadcast a week later. The performance is later released on LP and CD, the first of 7 operas that Toscanini conducts on radio.