| Country: | Victoria |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 11 May 1918 |
| Vote Type: | Popular |
| Image1: | Portrait of S.M. Bruce.png |
| Candidate1: | Stanley Bruce |
| Party1: | Nationalist Party (Australia) |
| Popular Vote1: | 14,455 |
| Percentage1: | 64.0% |
| Swing1: | 2.8pp |
| Candidate2: | Gordon Holmes |
| Party2: | Australian Labor Party |
| Popular Vote2: | 7,740 |
| Percentage2: | 34.3% |
| Swing2: | 4.5pp |
| MP | |
| Before Election: | William Irvine |
| Before Party: | Nationalist Party (Australia) |
| After Election: | Stanley Baldwin |
| After Party: | Nationalist Party (Australia) |
| Election Name: | 1918 Flinders by-election |
A by-election was held for the Australian House of Representatives seat of Flinders on 11 May 1918. This was triggered by the resignation of Nationalist MP Sir William Irvine to become Chief Justice of the Supreme Court of Victoria.
The Victorian Farmers' Union withdrew their candidate after extracting a promise from the Nationalist government to introduce preferential voting, although his name remained on the ballot paper.[1] The by-election was won by Nationalist candidate and future Prime Minister Stanley Bruce.