| Ward | Details | Result |
| Abbey | 2 vacancies - November 1945 | Lab gain from Con |
| Trumpington | 2 vacancies - November 1945 | Lab gain from Ind |
| Market | Byelection - October 1950 | Con gain from Ind |
| Abbey | 2 vacancies - May 1952 | Lab gain from Con |
| Market | Byelection - September 1956 | Con gain from I.C |
| Cherry Hinton | Byelection - January 1959 | Con gain from Lab |
| West Chesterton | Byelection - December 1963 | Lab gain from Con |
| Castle | Byelection - June 1964 | Con gain from Lib |
| Market | Byelection - November 1964 | Con gain from Lib |
| East Chesterton | 2 vacancies - May 1965 | Con gain from Lab |
| St Matthew's | Byelection - November 1966 | Ind gain from Lab |
| Cherry Hinton | Byelection - October 1968 | Con gain from Lab |
| Market | Byelection - June 1970 | Lib gain from Con |
| Newnham | 2 vacancies - May 1971 | Lab gain from Con |
| Cherry Hinton | Byelection - October 1975 | Con gain from Lab |
| Romsey | Byelection - December 1981 | SDP gain from Lab |
| East Chesterton | Byelection - May 1985 | Lab gain from Con |
| Coleridge | Byelection - January 1989 | Lab gain from Con |
| Arbury | Byelection - February 2000 | LDm gain from Lab |
| Coleridge | Byelection - November 2010 | Lab gain from Con |
| Queen Edith's | Byelection - November 2014 | LDm gain from Lab |
| Romsey | Byelection - June 2015 | Lab gain from LDm |
| King's Hedges | Byelection - July 2023 | Con gain from Lab |
Tabulation and web presentation copyright © Keith Edkins 2023; Colin Rosenstiel 2015.