This is a timeline of the development of radio in Northern Ireland.
1970s
1975
1 January – BBC Radio Ulster is launched, and becomes the first full-time radio station for Northern Ireland. It replaces what had been an opt-out of BBC Radio 4 (previously the BBC Northern Ireland Home Service) and launches as a result of the BBC's widely regarded under-reporting of the UWC Strike in May 1974.
1976
16 March – Independent Local Radio begins in Northern Ireland when Downtown Radio starts broadcasting.
1977
No events.
1978
No events.
1979
11 September – BBC Radio Foyle launches as an opt-out station from BBC Radio Ulster.
1980s
1980
No events.
1981
No events.
1982
No events.
1983
Plans for a station, Northside Sound, in the Derry region collapse.
1984
No events.
1985
No events.
1986
1 October – Downtown Radio's broadcast area is expanded when it begins broadcasting to the north western area of Northern Ireland.
1987
Late in 1987, Downtown Radio begins broadcasting to the Enniskillen and Omagh areas of Northern Ireland and to coincide with its expanded broadcast area, the station rebrands itself as 'DTRFM' to reflect that it now broadcasts to wider areas of Northern Ireland.
1988
24 November – BBC Radio 1 starts broadcasting on FM in Belfast.
1989
No events.
1990s
1990
7 February – Cool FM begins broadcasting to Belfast on FM. Downtown Radio continues on MW in Belfast and on FM across Northern Ireland.
6 April – Belfast Community Radio launches.
4 June – CityBeat begins broadcasting to Belfast.
1991
No events.
1992
Belfast Community Radio adopts a classic hits format and renames itself as Classic Trax BCR.
1993
No events.
1994
Classic Trax BCR relaunches as 96.7 BCR.
1995
Townland Radio begins broadcasting on 828 kHz in Cookstown, Northern Ireland.
1996
Radio 1521 launches. Broadcasting from Craigavon, the station covers much of mid-Ulster.
30 September – Belfast Community Radio closes and is replaced by CityBeat.
1997
Townland Radio is relaunched as Goldbeat.
1998
Radio 1521 is relaunched as Heartbeat 1521.
1999
22 May – Goldbeat and Heartbeat 1521 close down and both AM licences are handed back to the then UK regulator The Radio Authority
19 August – BBC Radio 1 broadcasts its first split programming when it introduces weekly national new music shows for Scotland, Wales and Northern Ireland. The Session in Northern Ireland is presented by Colin Murray and Donna Legge.
2000s
2000
26 January – Q97.2, fully known as Q97.2 Causeway Radio, begins broadcasting to the Coleraine area of Northern Ireland.
2001
No events.
2002
19 March – Q101.2 begins broadcasting to Omagh and Enniskillen.
After years of campaigning by locals for the re-advertising of a radio licence for Mid-Ulster, Ofcom awards an FM licence for the area to Belfast CityBeat and launches the station as Mid FM.
2003
1 February – Mid 106 FM begins broadcasting across mid Ulster.
2004
No events.
2005
14 November – U105 launches as a music and speech station covering Belfast-based radio station
2006
Mid FM is rebranded to 6FM.
15 September – Raidió Fáilte launches as an Irish-language community radio station, broadcasting from Belfast. Previously the station had operated as a pirate radio station.
2007
CityBeat becomes available in North Belfast, Newtownabbey and Carrickfergus and later in the year, another FM transmitter opens, covering the Bangor area.
2008
No events.
2009
Belfast-based community station Blast 106 launches.
2010s
2010
26 July – The BBC announces a trial scheme under which BBC Radio Foyle would be available on DAB as a part-time sidecar station to Radio Ulster, using a similar format as the part-time longwave-programming optouts of BBC Radio 4 on the BBC National DAB multiplex. During this trial, the bitrate of Radio Ulster drops during Foyle's separate broadcast hours, with Foyle carried as a split audio stream in the remaining space; outside of split shows, the full bitrate would revert to Radio Ulster.
2011
November – 6FM is rebranded to 6FM in 2006 and changed name again to Q106.7 FM.
2012
28 June – Community station Lisburn's 98FM launches.
December – Downtown Radio opens a small studio in Derry ahead of the city’s year of being UK City of Culture. It remains open and in use, mainly at the weekend with presenter-led programming on Saturday afternoon and Sunday covering a range of events in the region.
2013
26 July – Digital radio is switched on in Northern Ireland allowing a further 1.4 million listeners to hear stations such as Smooth 70s, Absolute Radio 90s and Jazz FM.
2014
No events.
2015
6 July – Fuse FM Ballymoney launches as a full time community station., becoming the first radio station in the UK to serve the Ulster Scots Community.
9 August – The Q Radio Network launches. The network covers seven licence areas including Belfast which sees Citybeat subsumed into the new network.
2016
No events.
2017
No events.
2018
No events.
2019
No events.
2020s
2020
No events.
2021
6 May – BBC Radio Ulster and BBC Radio Foyle stop broadcasting on MW.
2022
No events.
2023
7 December – Downtown Radio stops broadcasting on MW.