Dublin City was an Irish borough constituency in the House of Commons of the United Kingdom of Great Britain and Ireland. It comprised the city of Dublin in the county of Dublin, and was represented by two Members of Parliament from its creation in 1801 until 1885.

In 1885, Dublin City was split into four divisions which were separate single member constituencies: Dublin College Green, Dublin Harbour, Dublin St Stephen's Green and Dublin St Patrick's.

The city of Dublin was accounted a county of itself, although it remained connected with County Dublin for certain purposes. A Topographical Directory of Ireland, published in 1837, describes the Parliamentary history of the city:

The city returns two members to the Imperial parliament; the right of election, formerly vested in the corporation, freemen, and 40s. freeholders, has been extended to the £10 householders, and £20 and £10 leaseholders for the respective terms of 14 and 20 years, by the act of the 2nd of William IV., cap. 88. The number of voters registered at the first general election under that act was 7041, of which number, 5126 voted. The limits of the city, for electoral purposes, include an area of 3538 statute acres, the boundaries of which are minutely detailed in the Appendix; the number of freemen is about 3500, of whom 2500 are resident and 1000 non-resident, and the number of £10 houses is 16,000 : the sheriffs are the returning officers.

The boundary was defined in the Parliamentary Boundaries (Ireland) Act 1832 as:

The County of the City of Dublin, and such Parts of the County at large as lie within the Circular Road.

From 1832 (when registers of electors were first prepared) a turnout figure is given, for the percentage of the registered electors who voted. If the number of registered electors eligible to take part in a contested election is unknown, then the last known electorate figure is used to calculate an estimated turnout. If the numbers of registered electors and electors taking part in the poll are known, an exact turnout figure is calculated. In two member elections (in which an elector could cast one or two votes as he chose), where the exact number of electors participating is unknown, an estimated turnout figure is given. This is calculated by dividing the total number of votes cast by two. To the extent that electors used only one of their votes the estimated turnout figure is an underestimate.