Raidió Teilifís Éireann (pronounced [ˈɾˠadʲiːoː ˈtʲɛlʲəfʲiːʃ ˈeːɾʲən̪ˠ] ^ⓘ; Irish for 'Radio [and] Television of Ireland'; RTÉ) is an Irish public service broadcaster. It produces and broadcasts programmes on television, radio and online. The radio service began in 1926, with regular television broadcasts beginning on 31 December 1961, making it one of the oldest continuously operating public service broadcasters in the world. It is headquartered in Donnybrook in Dublin, with offices across Ireland.

RTÉ is a statutory body, overseen by a board appointed by the Irish government, with general management in the hands of a committee of senior managers, currently an interim leadership team, headed by the Director General. RTÉ is regulated by Coimisiún na Meán. It is financed by the television licence fee and through advertising, with some of its services funded solely by advertising, while others are funded solely by the licence fee.

The current network consists of four main television channels (RTÉ One, RTÉ2, RTÉjr and RTÉ News) and four FM radio stations (RTÉ Radio 1, RTÉ 2fm, RTÉ Lyric FM and RTÉ Raidió na Gaeltachta). RTÉ also has a number of digital radio services, with RTÉ Gold being its only online station with a full schedule. The broadcaster operates a number of online services including a news website and app, as well as streaming service RTÉ Player. RTÉ previously owned 50% of sports broadcaster GAAGO, which in turn operated LOI TV.

Radio Éireann, RTÉ's predecessor and at the time a section of the Department of Posts and Telegraphs, was one of 23 founding organisations of the European Broadcasting Union in 1950. RTÉ also publishes weekly listings and lifestyle magazine, the RTÉ Guide.

Broadcasting in Ireland began in 1926 with 2RN in Dublin. From that date until June 1960 the broadcasting service (2RN, later Radio Éireann) operated as a section of the Department of Posts and Telegraphs. Those working for the service were directly employed by the Irish Government and regarded as civil servants.

RTÉ was established on 1 June 1960 (as the Radio Éireann Authority) under the Broadcasting Authority Act 1960, the principal legislation under which it still operates. The existing Radio Éireann service was transferred to the new authority, which was also made responsible for the new television service (Telefís Éireann). The television service started broadcasting on 31 December 1961, from the Kippure transmitter site near Dublin. Eamonn Andrews was the first Chairman of Radio Éireann, the first director-general was Edward Roth. The name of the authority was changed, at the suggestion of Áine Ní Cheanainn, to Radio Telefís Éireann by the Broadcasting Authority (Amendment) Act 1966, and both the radio and television services became known as RTÉ in that year.

Section 113 of the Broadcasting Act 2009 changed the name of the organisation from "Radio Telefís Éireann" to "Raidió Teilifís Éireann", to reflect the current standard spelling of the name in Irish.

The "É" in RTÉ is often pronounced as the English letter "E". However, in the Irish language "É" is pronounced [eː].