A by-election was held in the Marston ward on Thursday 18 July 2024.
Results were announced following the count, late on Thursday 18 July 2024.
Kate Robinson (Green Party) has been duly elected.
| Name of Candidate | Description (if any) | Number of votes | Elected? |
|---|---|---|---|
| HATFIELD, Duncan Valentine | The Conservative Party Candidate | 70 | |
| MAJEED, Nasreen | Independent Oxford Alliance | 596 | |
| NORMAN, Kathy | Liberal Democrat | 55 | |
| ROBINSON, Kate Josephine | Green Party | 640 | Elected |
| VINNICOMBE, Charlotte Louise | Labour Party | 495 |
Turnout: 39.4%
