Map - Derry (City of Derry)

Derry, officially Londonderry, is the second-largest city in Northern Ireland and the fifth-largest city on the island of Ireland. The old walled city lies on the west bank of the River Foyle, which is spanned by two road bridges and one footbridge. The city now covers both banks (Cityside on the west and Waterside on the east).

The population of the city was 83,652 at the 2001 Census, while the Derry Urban Area had a population of 90,736. The district administered by Derry City and Strabane District Council contains both Londonderry Port and City of Derry Airport. Derry is close to the border with County Donegal, with which it has had a close link for many centuries. The person traditionally seen as the founder of the original Derry is Saint Colmcille, a holy man from Tír Chonaill, the old name for almost all of modern County Donegal, of which the west bank of the Foyle was a part before 1610.

In 2013, Derry was the inaugural UK City of Culture, having been awarded the title in 2010.

Despite the official name, the city is commonly known as Derry, which is an anglicisation of the Irish Daire or Doire, and translates as 'oak-grove/oak-wood'. The name derives from the settlement's earliest references, Daire Calgaich ('oak-grove of Calgach'). The name was changed from Derry in 1613 during the Plantation of Ulster to reflect the establishment of the city by the London guilds.

Derry has been used in the names of the local government district and council since 1984, when the council changed its name from Londonderry City Council to Derry City Council. This also changed the name of the district, which had been created in 1973 and included both the city and surrounding rural areas. In the 2015 local government reform, the district was merged with the Strabane district to form the Derry City and Strabane district, with the councils likewise merged.

According to the city's Royal Charter of 10 April 1662, the official name is Londonderry. This was reaffirmed in a High Court decision in 2007.

The 2007 court case arose because Derry City Council wanted clarification on whether the 1984 name change of the council and district had changed the official name of the city and what the procedure would be to effect a name change. The court clarified that Londonderry remained the official name and that the correct procedure to change the name would be via a petition to the Privy Council. Derry City Council afterward began this process, and was involved in conducting an equality impact assessment report (EQIA). Firstly it held an opinion poll of district residents in 2009, which reported that 75% of Catholics and 77% of Nationalists found the proposed change acceptable, compared to 6% of Protestants and 8% of Unionists. The EQIA then held two consultative forums, and solicited comments from the general public on whether or not the city should have its name changed to Derry. A total of 12,136 comments were received, of which 3,108 were broadly in favour of the proposal, and 9,028 opposed it. On 23 July 2015, the council voted in favour of a motion to change the official name of the city to Derry and to write to Mark H. Durkan, the Northern Irish Minister for the Environment, to ask how the change could be effected.

The name Derry is preferred by nationalists and it is broadly used throughout Northern Ireland's Catholic community, as well as that of the Republic of Ireland, whereas many unionists prefer Londonderry; however, in everyday conversation Derry is used by most Protestant residents of the city. Linguist Kevin McCafferty argues that "It is not, strictly speaking, correct that Northern Ireland Catholics call it Derry, while Protestants use the Londonderry form, although this pattern has become more common locally since the mid-1980s, when the city council changed its name by dropping the prefix". In McCafferty's survey of language use in the city, "only very few interviewees—all Protestants—use the official form".

Apart from the name of the local council, the city is usually known as Londonderry in official use within the UK. In the Republic of Ireland, the city and county are almost always referred to as Derry, on maps, in the media and in conversation. In April 2009, however, the Republic of Ireland's Minister for Foreign Affairs, Micheál Martin, announced that Irish passport holders who were born there could record either Derry or Londonderry as their place of birth. Whereas official road signs in the Republic use the name Derry, those in Northern Ireland bear Londonderry (sometimes abbreviated to L'derry), although some of these have been defaced with the reference to London obscured. Usage varies among local organisations, with both names being used. Examples are City of Derry Airport, City of Derry Rugby Club, Derry City FC and the Protestant Apprentice Boys of Derry, as opposed to Londonderry Port, Londonderry YMCA Rugby Club and Londonderry Chamber of Commerce. The bishopric has always remained that of Derry, both in the (Protestant, formerly-established) Church of Ireland (now combined with the bishopric of Raphoe), and in the Roman Catholic Church. Most companies within the city choose local area names such as Pennyburn, Rosemount or Foyle from the River Foyle to avoid alienating the other community. Londonderry railway station is often referred to as Waterside railway station within the city, but is called Derry/Londonderry at other stations. The council changed the name of the local government district covering the city to Derry on 7 May 1984, consequently renaming itself Derry City Council. This did not change the name of the city, although the city is coterminous with the district, and in law, the city council is also the Corporation of Londonderry or, more formally, the Mayor, Aldermen and Citizens of the City of Londonderry. The form Londonderry is used for the post town by the Royal Mail; however, use of Derry will still ensure delivery.

The city is also nicknamed "the Maiden City" by virtue of the fact that its walls were never breached despite being besieged on three separate occasions in the 17th century, the most notable being the Siege of Derry of 1688–1689. It was also nicknamed "Stroke City" by local broadcaster Gerry Anderson, owing to the politically correct use by some of the dual name Derry/Londonderry (which has itself been used by BBC Television). A later addition to the landscape has been the erection of several large stone columns on main roads into the city welcoming drivers, euphemistically, to 'the Walled City'.