1904 in radio

• 7 January (with effect from 1 February) – The Marconi Company establishes "CQD" as one of the first international maritime radio distress signals.{{cite web|title=Radio in History|work=On This Day|url=https://www.onthisday.com/literature/radio|accessdate=2019-10-22}}
• 24 May – The United States Patent Office awards Marconi a patent for a "Wireless signaling system".{{US patent|760463}}.
• 11 October – Brazilian priest and researcher Roberto Landell de Moura is awarded a patent by the United States Patent Office for a "Wave-transmitter".{{US patent|771917}}
• 16 November – English electrical engineer John Ambrose Fleming, working for Marconi, is awarded a United States patent for the Fleming valve, the first thermionic vacuum tube, a two-electrode diode, which he calls the oscillation valve.{{US patent|803684}}.
• First radio transmission of music, at Graz, Austria.{{cite web|title=Radio/Broadcasting Timeline|work=CBN History|publisher=WCBN|URL=http://www.wcbn.org/history/wcbntime.html|accessdate=2019-10-22|archive-date=2022-03-01|archive-url=https://web.archive.org/web/20220301024429/http://www.wcbn.org/history/wcbntime.html|url-status=dead}}{{Additional citation needed|date=October 2019}}

• 5 January – Anona Winn, Australian-born British broadcasting personality (d. 1994)
• 15 January – Charles Hill, British physician, medical and broadcast executive, politician and "The Radio Doctor" (d. 1989)
• 23 February – William L. Shirer, American war correspondent (d. 1993)
• 8 May – John Snagge, English radio newsreader (d. 1996)
• 24 May – Sefton Delmer, German-born British propaganda radio broadcaster (d. 1979)
• 14 August – Lindley Fraser, Scottish-born academic economist and broadcaster (d. 1963)
• 27 October – Les Mitchel, American radio and film producer, director and actor (d. 1975)Armstrong, Alice Catt (1950). [https://books.google.com/books?id=ZtFusY5LTuoC&q=october+27+1904+%22les+mitchel%22&dq=october+27+1904+%22les+mitchel%22 Who's Who in Los Angeles County]. Los Angeles, CA: Who's Who Historical Society. p. 145. {{ISSN|0508-6930}}.{{Cite news|title=Obituaries: Les Mitchel|author=|date=January 22, 1975|work=Variety|page=94|id={{ProQuest|1401273197}}}}
• 24 November – Pegeen Fitzgerald, American radio talk-show host (both alone and with her husband, Ed) on WOR and WJZ in New York City{{cite news|last1=Flint|first1=Peter B.|title=Pegeen Fitzgerald, 78, Radio Host Of Family-Style Talk Show, Dies|url=https://www.nytimes.com/1989/01/31/obituaries/pegeen-fitzgerald-78-radio-host-of-family-style-talk-show-dies.html|accessdate=11 April 2016|work=The New York Times|date=January 31, 1989}} and Norcatur, Kansas (d. 1989){{cite journal|title=Pegeen Fitzgerald|journal=Radio Television Mirror|date=March 1951|volume=35|issue=4|page=80|url=https://archive.org/stream/radiotel00macf#page/n316/mode/1up|accessdate=9 April 2016}}

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Category:Radio by year

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