| Election Name: | 1904 Horsham by-election |
| Type: | presidential |
| Country: | United Kingdom |
| Previous Election: | Horsham (UK Parliament constituency)#Elections in the 1900s |
| Previous Year: | 1900 |
| Next Election: | Horsham (UK Parliament constituency)#Elections in the 1900s |
| Next Year: | 1906 |
| Election Date: | 11 November 1904 |
| Candidate1: | Turnour |
| Party1: | Conservative Party (UK) |
| Popular Vote1: | 4,388 |
| Percentage1: | 54.9% |
| Candidate2: | Erskine |
| Party2: | Liberal Party (UK) |
| Popular Vote2: | 3,604 |
| Percentage2: | 45.1% |
| Map Size: | 250px |
| MP | |
| Posttitle: | Subsequent MP |
| Before Election: | Johnstone |
| Before Party: | Conservative Party (UK) |
| After Election: | Viscount Turnour |
| After Party: | Conservative Party (UK) |
The 1904 Horsham by-election was held on 11 November 1904. This resulted in the election of the Conservative, Viscount Turnour who held the seat for the incumbent party.
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