Labour candidate Susan Ann Elsmore has won the Canton, Cardiff by-election. The results are:
| Candidate | Description | Votes Cast |
| BATEMAN, Steffan Kitka | Trade Unionist and Socialist Coalition | 101 |
| ELSMORE, Susan Ann | Welsh Labour | 1201 ELECTED |
| GRIFFITHS, David Jason | Green Party | 148 |
| HEMSLEY, Matthew | Welsh Liberal Democrats | 80 |
| RICHARDS, Pamela Dawn | Welsh Conservative Party | 381 |
| TUDUR, ELIN | Plaid Cymru – The Party of Wales | 972 |
