Television in Portugal was introduced in 1956 (test broadcasts) by Radiotelevisão Portuguesa (now named Rádio e Televisão de Portugal), which held the nationwide television monopoly until late 1992. Regular broadcasting was introduced on March 7, 1957. Colour transmissions were introduced on March 10, 1980.

Digital terrestrial television (DTT) was introduced at a very late stage when compared to other countries in Europe and with limited channels, and according to the European Audiovisual Observatory it occupies the last place in 34 European countries with the weakest offer on digital terrestrial television, in such a way that most Portuguese are subscribers of cable (HFC) or IPTV (DSL or FTTH) platforms, in percentages higher than in the rest of Europe and these platforms are well developed with many channels. During the transition from analog to DTT, subscription-based television services experienced a 10% increase and reached 72.5% of homes in 2012. Outside of the internet, there are no regional or local television channels - with the exception of the autonomous state TV channels, RTP Açores and RTP Madeira -, although a couple of pay TV channels are partly or wholly dedicated to regional matters. Portuguese television is regulated by the Entidade Reguladora para a Comunicação Social (ERC).^[2]

In 1953, a group on behalf of Emissora Nacional de Radiodifusão (later RDP) was set up examining the feasibility of a television service in Portugal. The group started a preliminary work for a network of television signals, with a budget on the order of 500,000 escudos. A foreign company had a proposal for the setup of the television network, including the possibility by a foreign company, with high foreign capital, tasking up a proposal for the building of the network and having the exclusive rights of the selling of television sets in the country for a determined period of time^[3] In July 1954, their report A Televisão em Portugal (Television in Portugal) was published and was built upon the following pillars:

• 1. The current status of TV and the opportunity for its introduction in Portugal
• 2. The operating system to be adopted
• 3. The solution that seems possible
• 4. Outline of an initial plan and related charges
• 5. Economic study
• 6. List of work already carried out by ENR.^[4]

On March 7, 1957 public broadcaster Rádio e Televisão de Portugal (RTP) began broadcasting RTP1, the first television channel in the country. A second RTP channel, RTP2, started broadcasting on December 25, 1968. Private commercial channels were launched in the early 1990s, with SIC on October 6, 1992, and TVI on February 20, 1993.

In 2021, the 24-hour television news channel TVI 24 was revamped and started to broadcast as CNN Portugal. In December 2021, Lisbon-headquartered investment management firm Alpac Capital signed an agreement to buy a controlling stake in the pan-European television news network Euronews from Egyptian telecoms magnate Naguib Sawiris.^[5][6][7]

Analog broadcasts in Portugal were discontinued on April 26, 2012. There are eight free-to-air channels on Portuguese terrestrial TV: 6 are owned by the public service broadcaster RTP (with 2 being regional channels that broadcast FTA only in the Madeira and Azores Autonomous Regions), two are from private broadcasters (SIC and TVI) and one is owned by the Assembly of the Republic and broadcasts parliamentary sessions (like BBC Parliament). See Digital terrestrial television in Portugal

HD broadcasts in Portugal began around the late 2000s mostly for sports events through temporary channels. During the 2010s, high definition gained more traction as the standard quality for TV broadcasts with by the end of the decade most television channels having an HD feed. However, high definition is still only available through pay TV services since, as of 2023, it has yet to be implemented for Portuguese Terrestrial Digital Television.

• For the UEFA Euro 2008, TVI became the first Portuguese channel to broadcast in HD, launching TVI HD to broadcast the event (although TVI wouldn't have a permanent HD simulcast until September 2019).
• Also for the UEFA Euro 2008, SportTV launched an HD channel called SportTV HD, and in the beginning of 2009 SportTV HD became a permanent channel, until August 13, 2011, when it was replaced by a simulcast of SportTV 1 and all other Sport TV channels begun broadcasting in HD as well.
• For the Beijing Olympics 2008, RTP launched RTP HD, but this one had non-continuous programming, broadcasting only the Olympics during night time and some RTP2 sports programing during the day.
  • During the day the channel would be closed from 7 am until 3 pm, then it would broadcast RTP 2's Desporto 2 and afterwards it would close until 9 pm to show prime-time TV shows during the week and movies during weekend. During the night, RTP HD would show the Olympics with the time from 12 am to 2 am consisting of reruns and the time from 2 am to 7 am consisting of live events.
  • In 2011, RTP relaunched RTP HD, now with a different name, RTP1 HD, now maintaining regular broadcasts, until November 28, 2017, when it became a permanent simulcast of RTP 1. Meanwhile, RTP 2 would only get its own HD feed on July 2, 2019.
• SIC started test broadcasts in HD in 2009, with UEFA Europa League broadcasts. The channel would however remain inactive afterwards, until 2016 when it began to broadcast certain events in high definition. It wouldn't be until October 6, 2016, the 24th anniversary of the first official broadcasts of SIC, when the channel would finally be implemented as a permanent HD simulcast of SIC, alongside all other SIC owned channel also getting HD feeds.
• Thematic channels on pay TV services begun broadcasting in HD, during the late 2000s, with MOV being the first one to do so in 2008, followed by other channels such as AXN, FOX, FOX Life, TVCine and Syfy in 2009.
  • This process would continue for other pay TV channels over the course of the 2010s, although some like Disney Channel, Cartoon Network and Nickelodeon would only receive HD feeds by 2021, 2022 and 2024 respectively and some channels like BBC News are still broadcasting at standard definition only, despite already having HD signals in other countries in Europe for several years.
• A HD channel is present on Portuguese Digital Terrestrial Television but has yet to be actually used.

Optimus Clix has launched in 2006 a service called SmarTV (rebranded as Optimus Clix TV), provided on Amino and Motorola STBs, with VoD provided by Kasenna MediaBase video servers. The service would be merged into ZON in 2014 to create NOS.

PT Comunicações /Portugal Telecom, now Altice Portugal, has also launched its own IPTV service called MEO, after spuning off its subsidiary PT Multimédia (now NOS) in 2007.

Vodafone also launched an IPTV service called Vodafone Casa TV, now just simply known as Vodafone TV.

All cable providers in Portugal, NOS and Nowo, introduced digital television (DVB-C). However, some providers still offer analog cable.^[8]

Digital satellite services have existed since 1998. Currently, the providers are NOS and MEO operating in Hispasat.

All operators had mobile TV under UMTS platforms. It was abandoned in favor of web-TV applications for mobile devices.

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• List of Portuguese language television channels
• List of television stations in Portugal
• Media of Portugal
• List of newspapers in Portugal
• List of radio stations in Portugal
• Telecommunications in Portugal