The year 1928 saw a number of significant events in radio broadcasting history.
- 1 January – Algemeene Vereeniging Radio Omroep begins broadcasting in the Netherlands.
- 2 January – The BBC broadcasts the first Daily Service – a 15-minute act of Christian worship – from Savoy Hill. The programme is still broadcast five mornings a week on BBC Radio 4.
- 30 January – First radiotelephone connection between the Netherlands and the United States.
- 25 March – Italian radio broadcasts its first live football commentary: the game is an international match between Italy and Hungary.
- 27 March – KGB (AM) in San Diego begins broadcasting.
- 2 May – KPQ (AM) in Wenatchee, Washington begins broadcasting.
- 7 July – The French government issues an order limiting the list of private radio stations permitted to continue broadcasting to: Poste Parisien, Radio Agen, Radio Béziers, Radio Bordeaux Sud-Ouest, Radio Juan-les-Pins, Radio LL, Radio Lyon, Radio Mont-de-Marsan, Radio Montpellier, Radio Nîmes, Radio Paris, Radio Toulouse, and Radio Vitus.
- 13 September – KOH-AM in Reno, Nevada begins broadcasting.
- 28 October – Radio Ljubljana begins regularly programmed transmissions.
- 1 November – The first official broadcast in Romanian is aired by the Societatea de Difuziune Radiotelefonică (Radiotelephonic Broadcasting Company) in Bucharest.
- 11 November – General Order 40 is implemented by the United States government; this allows the classification of each allocation in the AM band as either "Local," "Regional," or "Clear." This allows for the creation of clear-channel stations broadcasting at maximum power at night.
- 11 November – KXO (AM) in El Centro, California begins broadcasting.
- 11 November – WGL (AM) in Fort Wayne, Indiana begins broadcasting.
- 11 November – WMT (AM) in Cedar Rapids, Iowa begins broadcasting.
- 11 November – WOL (AM) in Washington, D.C. begins broadcasting.
- 20 November – WGH (AM) in Newport News, Virginia begins broadcasting.
- 23 December – NBC sets up its first permanent, coast-to-coast radio network.
- 3 January – The Voice of Firestone (1928–1956), a classical-music program, debuts on NBC.
- 4 January – The Dodge Victory Hour, a variety show, debuts on NBC.
- 19 March – Amos 'n' Andy debuts through the NBC Blue Network, broadcasting from WMAQ-AM, a radio station owned by the Chicago Daily News.
- 19 November – Happy Station Show (1928–1995), hosted by Eddy Startz from 1928 until 1970.
- 21 May – Tom Donahue, pioneering American rock and roll radio disc jockey and freeform rock pioneer (died 1975)
- 17 August – Willem Duys, Dutch radio/television host (died 2011)
- 17 September – Brian Matthew, English disc jockey (died 2017)
- 20 October – Michael O'Donnell, English physician, journalist, medical campaigner and broadcaster (died 2019)
- 9 November – Wim Bosboom, Dutch radio/television host
- Algemeene Vereeniging Radio Omroep (AVRO) begins broadcasting (Neth) January 1 in History
- 80 Years of Religious Broadcasting on the BBC
- 1st radio telephone connection between Netherlands and US January 30 in History
- KGB-AM in San Diego, California begins radio transmissions March 27 in History
- KPQ-AM in Wenatchee WA begins radio transmissions May 2 in History
- 100 ans de radio
- KOH-AM in Reno NV begins radio transmissions September 13 in History
- Radio and Radiophony in Romania
- KXO-AM in El Centro California begins radio transmissions November 11 in History
- WMT-AM in Cedar Rapids IA begins radio transmissions November 11 in History
- WOL-AM in Washington D.C. begins radio transmissions November 11 in History
- WGH-AM in Newport News Virginia begins radio transmissions November 20 in History
- NBC sets up a permanent, coast-to-coast radio network December 23 in History
- "Amos and Andy" debuts on radio (NBC Blue Network-WMAQ Chicago) March 19 in History
- Willem Duys, Dutch radio/TV host August 17 in History.
- Wim Bosboom, Dutch radio/TV host November 9 in History.