May 22 – The US Federal Communications Commission (FCC) increases its limits for single ownership of television stations from three to five.
May 25 – First commercial U.S. telecast by relay. Eddie Cantor is broadcast from NBC's Manhattan station WNBT to Philco's Philadelphia station WPTZ, via an automatic relay tower halfway between the two cities. (The AT&T corporation's coaxial cable between the cities is unavailable because of the war.) NBC stops broadcasting Cantor in the middle of his rendition of the song "We're Having a Baby, My Baby and Me" when it finds some of the lyrics and his gestures "objectionable."
Paris télévision – Fernsehsender Paris stops broadcasting. Broadcasting is resumed by the new French government in October 1944 under the name Télévision française with the same technical equipment.
John Logie Baird demonstrates the world's first color television picture tube. Color movies are shown from a flying-spot scanner.