The 1865 United Kingdom general election saw the Liberals, led by Lord Palmerston, increase their large majority over the Earl of Derby's Conservatives to more than 80. The Whig Party changed its name to the Liberal Party between the previous election and this one.
The 1865 general election was regarded by contemporaries as being a generally dull contest nationally, which exaggerated the degree of corruption within individual constituencies. In his PhD thesis, Cornelius O'Leary described The Times as having reported "the testimony is unanimous that in the General Election of 1865 there was more profuse and corrupt expenditure than was ever known before". As a result of allegations of corruption, 50 election petitions were lodged, of which 35 were pressed to a trial; 13 ended with the elected MP being unseated. In four cases a Royal Commission had to be appointed because of widespread corrupt practices in the constituency.