County Wicklow was a parliamentary constituency in Ireland, represented in the Parliament of the United Kingdom. From 1801 to 1885 it returned two Members of Parliament (MPs) to the House of Commons of the United Kingdom of Great Britain and Ireland.
At the 1885 general election, under the Redistribution of Seats Act 1885, County Wicklow was divided into two parliamentary divisions: East Wicklow and West Wicklow.
This constituency comprised the whole of County Wicklow.
Acton resigned by accepting the office of Steward of the Chiltern Hundreds, causing a by-election.
Wentworth-FitzWilliam succeeded to the peerage, becoming 6th Earl FitzWilliam, causing a by-election.
Proby was appointed Comptroller of the Household, requiring a by-election.