A by-election took place in Godmanchester and Hemingford Abbots on 1 August 2019 after the resignation of Liberal Democrat councillor David Underwood. The seat was held for the Liberal Democrats by Sarah Wilson.
Alconbury by-election
A by-election took place in Alconbury on 12 December 2019 alongside the 2019 general election, following the resignation of Councillor Jim White. The seat was held for the Conservative Party by Ian Gardener.
A by-election took place in the St Ives South ward on 6 May 2021 alongside the 2021 local elections, following the passing of Councillor John Davies. The seat was held for the Conservative Party by Rianna D'Souza.
A by-election took place in the Warboys ward on 6 May 2021 alongside the 2021 local elections, following the passing of Councillor Jill Tavener. The seat was held for the Conservative Party by Michael Haines.