The 1909 Cork City by-election was held on 1 May 1909. The by-election was held due to the resignation of the incumbent Irish Parliamentary MP, William O'Brien. It was won by the All-for-Ireland candidate Maurice Healy.[1]
Cosbie was associated with the United Irish League wing of Irish Nationalism.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Independent Nationalist | Maurice Healy | 4,706 | 57.02 | N/A | |
| Irish Parliamentary | George Cosbie | 3,547 | 42.98 | N/A | |
| Majority | 1,159 | 14.04 | N/A | ||
| Turnout | 8,253 | 60.66 | N/A | ||
| Independent Nationalist gain from Irish Parliamentary | Swing | N/A | |||
| Registered electors | 13,605 | ||||