This is a list of parliamentary by-elections in Great Britain held between 1790 and 1800, with the names of the previous incumbent and the victor in the by-election.
[['27 December 1790', 'CONSTITUENCY', 'Buckinghamshire'], ['27 December 1790', 'C/U', 'u*'], ['Buckinghamshire', 'WINNER', 'James Grenville'], ['Buckinghamshire', 'CAUSE', 'Elevated to the peerage']]