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By-elections to the European Parliament in the United Kingdom were held during the period when the United Kingdom used single-member, first-past-the-post constituencies to elect Members of the European Parliament from 1979 to 1999: they were required when a member resigned, died or was disqualified. Six by-elections were held in this period, all retained by the holding party.
N/A (MEP re-elected at next election under a party-list system)
By-elections
London South West
The London South West by-election took place on 20 September 1979, a few months after the 1979 election. The elected MEP, Shelagh Roberts, was disqualified for holding an office of profit under the Crown. Roberts ran again and won, but with a significant swing against her.
The Midlands West by-election took place on 5 March 1987. It was caused by the death of Terry Pitt, the sitting MEP. The seat was retained by Labour, with a much reduced majority.
The Hampshire Central by-election took place on 15 December 1988. It was caused by the death of Basil de Ferranti, the sitting MEP. The seat was held by the Conservatives with a large majority.
The Merseyside West by-election took place on 12 December 1996. It was caused by the death of Kenneth Stewart, the sitting MEP. The seat was held by Labour with a reduced large majority.
The Yorkshire South by-election took place on 7 May 1998. It was caused by the retirement of Norman West, the incumbent MEP for 14 years. The seat was held by Labour, but saw a large reduction in the majority.
The North East Scotland by-election took place on 26 November 1998. It was caused by the death of Allan Macartney, the sitting MEP. The seat was held by the SNP, with an increased majority.
Northern Ireland Assembly vacancies are filled by co-option. Local Government by-election results are generally given on the page for the last election in that area.