The Sun is a daily national tabloid newspaper published in the United Kingdom and owned by News Corporation. Sister editions are published in Glasgow (The Scottish Sun) and Dublin (The Irish Sun). It has the tenth-largest circulation of any newspaper in the world and the largest circulation of any daily newspaper in the United Kingdom.

The Sun had an average daily circulation of 2,715,473 copies in October 2011. Between July and December 2010 it had an average daily readership of approximately 7.6 million, of whom approximately 2.65 million were in the ABC1 demographic and 4.9 million in the C2DE demographic.

The Sun has been involved in a number of controversies in its history, including its coverage of the Hillsborough football stadium disaster, falsely accusing Elton John of having had sexual relationships with rent boys, and its attitude towards mental health issues and homosexuality.

The Sun is published by the News Group Newspapers division of News International, itself a wholly owned subsidiary of Rupert Murdoch's News Corporation.