RTÉ One (Irish: RTÉ a hAon) is the flagship television channel of Raidió Teilifís Éireann (RTÉ), and it is the most popular and most watched television channel in Ireland. It was launched as Telefís Éireann on 31 December 1961, it was renamed RTÉ Television in 1966, and it was renamed as RTÉ One upon the launch of RTÉ Two in 1978. RTÉ is funded partly by the licence fee, the remainder of the funding is provided by commercial advertising, because RTÉ is funded partly by the licence fee it shows considerably fewer advertisements than most other channels available in Ireland.

Its headquarters is at Donnybrook, Dublin.

RTÉ One is available to 97% of the population through Saorview, it is also available on the most digital television services available in the Republic of Ireland such as Sky Ireland, UPC Ireland, Magnet Networks. It is available in most of Northern Ireland via analogue overspill, Sky and Virgin Media. The channel is also available online through RTÉ Live and the international version of RTÉ Player.

Read more about RTÉ One:  History, RTÉ One +1, Budget, Programming, On-air Identity, RTÉ One Main Analogue Transmitters

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