This is a list of parliamentary by-elections in the United Kingdom held between 1801 and 1806, with the names of the previous incumbent and the victor in the by-election.
In the absence of a comprehensive and reliable source for party and factional alignments in this period, no attempt is made to define them in this article. The House of Commons: 1790–1820 provides some guidance to the complex and shifting political relationships, but it is significant[ according to whom? ] that the compilers of that work make no attempt to produce a definitive list of each member's allegiances.
Where the cause of by-election is given as "resigned", this indicates that the incumbent was appointed on his own request to an "office of profit under the Crown". Offices used, in this period, were the Stewards of the Chiltern Hundreds or the Manor of East Hendred and the Escheators of Munster or Ulster. These appointments are made as a constitutional device for leaving the House of Commons, whose Members are not permitted to resign.
The c/u column denotes whether the by-election was a contested poll or an unopposed return. If the winner was re-elected, at the next general election and any intermediate by-elections, this is indicated by an * following the c or u. In a few cases the winner was elected at the next general election but had not been re-elected in a by-election after the one noted. In those cases no * symbol is used.
An incumbent who vacated a seat in the Irish Parliament, before the United Kingdom of Great Britain and Ireland came into existence on 1 January 1801, has (IP) following their name. In two cases two member seats in the Parliament of Ireland were reduced to single member constituencies in the United Kingdom Parliament, with both old seats being vacant at the start of the union and a by-election having to be held to fill the vacancy for the new seat.
Where a seat was vacated, because the incumbent member inherited a peerage or was created a peer or was appointed to an office, click the highlighted cause for further details of the particular circumstances. If the by-election date is highlighted, this is a link to an article about the by-election.
Windsor (/ˈwɪnzə/) is a constituency of the House of Commons in the UK Parliament represented since 2024 by Jack Rankin of the Conservative Party. It was re-created for the 1997 general election after it was abolished following the 1970 general election and replaced by the Windsor and Maidenhead constituency.
Edinburghshire was a Scottish county constituency of the House of Commons of the Parliament of Great Britain from 1708 to 1801 and of the Parliament of the United Kingdom from 1801 to 1918.
Inverness Burghs was a district of burghs constituency of the House of Commons of the Parliament of Great Britain from 1708 to 1801 and of the Parliament of the United Kingdom from 1801 to 1918. It elected one Member of Parliament (MP).
County Carlow was a parliamentary constituency in Ireland, which from 1801 to 1885 returned two Members of Parliament (MPs) to the House of Commons of the United Kingdom, and one MP from 1885 to 1922.
Waterford City was a United Kingdom parliamentary constituency, in southeast Ireland.
Bristol was a two-member constituency, used to elect members to the House of Commons in the Parliaments of England, Great Britain (1707–1800), and the United Kingdom. The constituency existed until Bristol was divided into single member constituencies in 1885.
Appleby was a parliamentary constituency in the county of Westmorland in England. It existed for two separate periods: from 1295 to 1832, and from 1885 to 1918.
Portsmouth was a borough constituency based upon the borough of Portsmouth in Hampshire. It returned two members of parliament (MPs) to the Parliaments of England, Great Britain and from 1801 the House of Commons of the Parliament of the United Kingdom, elected by the bloc vote system.
Oxfordshire was a county constituency of the House of Commons of the Parliament of England then of the Parliament of Great Britain from 1707 to 1800 and of the Parliament of the United Kingdom from 1801 to 1885. It was represented by two Members of Parliament. In 1832 this was increased to three Members of Parliament. The constituency was abolished in 1885, being split into three single member divisions.
Stamford was a constituency in the county of Lincolnshire of the House of Commons for the Parliament of England to 1706 then of the Parliament of Great Britain from 1707 to 1800 and of the Parliament of the United Kingdom from 1801 to 1918. It was represented by two Members of Parliament until 1868 when this was reduced to one.
This is a list of the MPs for Irish constituencies, who were elected at the 1802 United Kingdom general election, to serve as members of the 2nd UK Parliament from Ireland, or who were elected at subsequent by-elections. There were 100 seats representing Ireland in this Parliament.