This is a list of parliamentary by-elections in the United Kingdom since 2010, with the names of the incumbent and victor and their respective parties. Where seats changed political party at the election, the result is highlighted: blue for a Conservative gain, red for a Labour gain, orange for a Liberal Democrat gain, purple for a UKIP gain and other colours for any other gains. As of December 2022, a total of 47 by-elections have been held in this period. The first was held in January 2011 and the most recent in December 2022.
