The Daily Mirror is a British national daily tabloid newspaper. Founded in 1903, it is owned by parent company Reach plc. From 1985 to 1987, and from 1997 to 2002, the title on its masthead was simply The Mirror. It had an average daily print circulation of 716,923 in December 2016, dropping to 587,803 the following year. Its Sunday sister paper is the Sunday Mirror. Unlike other major British tabloids such as The Sun and the Daily Mail, the Mirror has no separate Scottish edition; this function is performed by the Daily Record and the Sunday Mail, which incorporate certain stories from the Mirror that are of Scottish significance.

Originally pitched to the middle-class reader, it was converted into a working-class newspaper after 1934, in order to reach a larger audience. It was founded by Alfred Harmsworth, who sold it to his brother Harold Harmsworth (from 1914 Lord Rothermere) in 1913. In 1963 a restructuring of the media interests of the Harmsworth family led to the Mirror becoming a part of International Publishing Corporation. During the mid-1960s, daily sales exceeded 5 million copies, a feat never repeated by it or any other daily (non-Sunday) British newspaper since. The Mirror was owned by Robert Maxwell between 1984 and 1991. The paper went through a protracted period of crisis after his death before merging with the regional newspaper group Trinity in 1999 to form Trinity Mirror.