| Election Name: | 1904 Riverina by-election |
| Country: | Australia |
| Type: | Parliamentary |
| Ongoing: | no |
| Previous Election: | 1903 Australian federal election |
| Previous Year: | 1903 |
| Election Date: | 18 May 1904 |
| Next Election: | 1906 Australian federal election |
| Next Year: | 1906 |
| Turnout: | 10,995 (57.77%) |
| Registered: | 19,031 |
| Seats For Election: | The Riverina seat in the House of Representatives |
| Candidate1: | John Chanter |
| Image1: | John Chanter, Australian politician in c.1901.jpg |
| Party1: | Protectionist Party |
| Popular Vote1: | 5,547 |
| Percentage1: | 51.7% |
| Swing1: | 1.7 |
| Candidate2: | Robert Blackwood |
| Party2: | Free Trade Party |
| Popular Vote2: | 5,184 |
| Percentage2: | 48.3% |
| Swing2: | 1.7 |
| MP | |
| Before Election: | Robert Blackwood |
| Before Party: | Free Trade Party |
| After Election: | John Chanter |
| After Party: | Protectionist Party |
A by-election was held for the Australian House of Representatives seat of Riverina on 18 May 1904. This was triggered after the result at the 1903 election, which had seen Free Trade candidate Robert Blackwood narrowly defeat Protectionist MP John Chanter, was declared void due to allegations of electoral irregularities.[1]
At the by-election Chanter defeated Blackwood.