| Country: | New South Wales |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 26 February 1927 |
| Vote Type: | Popular |
| Image1: | Ted Theodore 1931.jpg |
| Candidate1: | Ted Theodore |
| Party1: | Australian Labor Party |
| Popular Vote1: | 21,186 |
| Percentage1: | 62.6% |
| Swing1: | 1.5pp |
| Candidate2: | Walter Gee |
| Party2: | Nationalist Party (Australia) |
| Popular Vote2: | 12,667 |
| Percentage2: | 37.4% |
| Swing2: | 1.5pp |
| MP | |
| Before Election: | William Mahony |
| Before Party: | Australian Labor Party |
| After Election: | Ted Theodore |
| After Party: | Australian Labor Party |
| Election Name: | 1927 Dalley by-election |
A by-election was held for the Australian House of Representatives seat of Dalley on 26 February 1927. This was triggered by the resignation of Labor MP William Mahony.
The by-election was won by former Queensland Premier Ted Theodore, the Labor candidate. After the by-election there was some suggestion that Theodore had bribed Mahony to resign so that he might enter Parliament.[1] [2]