List of United Kingdom by-elections (2010–present)

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, turquoise for a Reform gain, green for a Green gain and other colours for any other gains.

As of February 2026, a total of 61 by-elections have been held in this period. The first was held in January 2011 and the most recent in February 2026.

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