Cover on 28 July 2017
|Founded||16 March 1999|
|Headquarters||Northcliffe House, Kensington High Street, London, England|
|Circulation||1.47 million (as of November 2017)|
Metro is the United Kingdom's highest circulation newspaper, published in tabloid format by DMG Media. The free newspaper is distributed from Monday to Friday (excluding bank holidays) mornings on trains, buses, stations, airports and hospitals across urban areas of England, Wales and Scotland. Distributors have also been employed to hand out copies to pedestrians.
Metro is owned by DMGT, part of the same media group as the Daily Mail and The Mail on Sunday, although in some areas Metro operates as a franchise with a local newspaper publisher, rather than as a wholly owned concern.
The Metro free newspaper concept originated in Sweden, where a publication of the same name was launched in 1995 by Metro International. British newspaper executives Jonathan Harmsworth and Murdoch MacLennan, from DMGT, were reportedly inspired by the idea and flew to Stockholm on a 'fact-finding mission' with a view to developing their own version. There were also reports in the late 1990s that both Metro International and Rupert Murdoch's News International were considering launching free newspapers in the UK which could be a commercial threat to DMGT's businesses.
DMGT subsequently launched Metro, using the same name as Metro International's publications but with a different logo on Tuesday March 16 1999. This UK version of Metro had no relation to Metro International or its sister newspapers in other countries. Metro was launched initially as a London-only newspaper with an original print run of 85,000 copies, which were distributed via dedicated bins in London Underground stations.  The newspaper was produced at DMGT's printworks and office complex at Surrey Quays in south east London, away from the company's main newspaper office in Kensington, west London.
In the years following its launch, the paper's distribution was gradually expanded to other major UK cities, including Manchester and Birmingham. By February 2003 Metro became operationally profitable for the first time. In 2004 its reach was extended further, becoming available in more urban areas including Nottingham, Bristol and Bath. 
Metro's circulation continued to rise in the following years, although readership temporarily dipped after the 7 July 2005 London bombings. There was a 1.8% decline - the equivalent of around 9,000 readers - in copies picked up in the weeks following the attacks due to a reduction in the number of people using London's public transport network, coupled with the temporary closure of some London Underground lines where Metro was distributed.
Following several years of national expansion, in 2006 the newspaper's production was moved to DMGT's main newspaper offices at Northcliffe House in Kensington, west London. That same year the newspaper expanded further, launching in Cardiff and Liverpool in joint venture deals with Trinity Mirror.
At the time of its 10th anniversary in 2009, the newspaper was distributed in 16 "major" UK cities and its circulation had grown to 1.3 million. Despite the increase in readership, that same year management also closed five regional Metro offices in Manchester, Glasgow, Newcastle, Birmingham and Bristol, which were responsible for producing regionalised arts, entertainment and food pages, citing "challenging economic conditions". 
By 2011 Metro's distribution network had expanded to more than 50 cities in the UK. That year media commentator Roy Greenslade said the publication was now making "bumper profits" and dubbed it "Britain's most successful national newspaper".
On 10 October 2005 Metro Ireland was launched in Dublin. It followed a legal battle over the title's name with the publishers of the Irish Independent and Dublin's Evening Herald, which launched its own free newspaper called Herald AM. Both titles were loss-making, despite having a combined circulation of 145,000 in the Greater Dublin Area. On 2 July 2009, it was announced that the two freesheets would merge under the Metro banner, an operation completed by 2010. However the Irish edition was closed down in December 2014.
For the first time in its history, Metro temporarily published seven days a week during the 2012 Summer Olympics and the 2012 Summer Paralympics, providing free copies to spectators at the Games as well as the general public. The newspaper struck a reported £2.25 million deal with sportswear manufacturer Adidas to run cover wrap adverts on each of the 17 days of the Olympics.
After more than a decade in charge, editor Kenny Campbell was replaced as editor by Ted Young in 2014. Young's appointment coincided with a number of changes at the newspaper, including the separation of the print and online editions, along with an expansion of Metro's distribution in the UK.
In 2017, Metro became the most-read newspaper in the UK, according to monthly National Readership Survey figures. In March 2018 Metro officially overtook The Sun in total print circulation, according to ABC (Audit Bureau of Circulations (UK)) figures.
The majority of the newspaper's content is produced at Northcliffe House in Kensington, west London. There are no regional editions within England and Wales, except for occasional differences in sports and arts content catered to specific local audiences. A separate, small team produces a Scottish edition of Metro, however often the only substantial difference between the two versions is the front page.
The newspaper is divided into three main sections - news, features and sport. The news section includes Guilty Pleasures, which typically contains two or four pages of showbiz and entertainment news, a letters page, and a page dedicated for business news. A popular feature of the letters page is Rush Hour Crush, in which readers send in anonymous messages to fellow users of public transport who they consider attractive. The daily column has led to at least one marriage. The news section also features occasional feature columns from political pundits such as Sophy Ridge of Sky News. However, while offering analysis, these columns do not typically express endorsements of political positions or candidates, thus not being considered as op-ed columns as in other newspapers.
The features section contains a mix of articles on travel, homes, style, and health, science, as well as arts coverage and entertainment listings. The puzzles page currently features a crossword and Sudoku.
Metro launched a website version of the newspaper, www
In 2014 production of the newspaper and the website were separated. As a result, Metro newspaper and Metro Online are now produced by separate organisations and written independently by different editorial teams, while remaining part of the same parent company.
The newspaper's content is now published online on a separate website, www
In the run-up to the United Kingdom general election, 2015, the-then UK Independence Party leader Nigel Farage refused to be interviewed by Metro after accusing the newspaper of being biased against his party. This was denied by the newspaper's editor. All other national party leaders agreed to be interviewed, including Conservative prime minister David Cameron and Labour leader Ed Miliband.
Prior to the United Kingdom European Union membership referendum, 2016 Metro published a front-page cover-wrap advert on behalf of the Leave campaign, paid for by the Democratic Unionist Party. The following day the newspaper published another cover-wrap advert, this time from the Remain campaign. Editor Ted Young said both adverts, which each cost more than £250,000 to place, generated around 300 complaints each, accusing the newspaper of both pro and anti Brexit bias.  Questions were subsequently raised as to why the Democratic Unionist Party placed an advert in Metro, because the newspaper does not publish in Northern Ireland.
Metro has faced competition in parts of the UK from other free newspapers, along with rivalry from paid-for national titles. Current editor Ted Young has said his 'mantra' is to produce a newspaper which its readers would be willing to pay for.
Metro International attempted to launch its own UK edition in 1999, being distributed in Newcastle upon Tyne's Tyne & Wear Metro system competing with DMGT's Metro. After battling alongside each other with the same name, Metro International's Metro changed its name to Morning News. This attempt was short-lived however, and Morning News was discontinued shortly afterwards.
In 2005 Rupert Murdoch said he was "worried" by competition from Metro and that it had damaged the circulation of his own newspaper The Sun. He told a press conference he was watching the free newspaper market "keenly and apprehensively". Murdoch's News International subsequently launched a London-based evening freesheet in 2006 called The London Paper. This was closed on 18 September 2009.
London Lite was another free, evening newspaper published in central London only from 2006 to 2009, at the time owned by the same parent company as Metro, and was seen as a 'spoiler' to protect against the commercial threat from The London Paper.
Metro launched two new mobile app products in 2016: 11versus11, which is a football news app, and Guilty Pleasures, a celebrity news app. Both apps offer personalised content based on a user's interest profile. 11versus11 won the Best Lifestyle, Sports & Entertainment App award at the 2017 European Digital Media Awards.