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The 1903 Dulwich by-election was a by-election held on 15 December 1903 for the British House of Commons constituency of Dulwich in South London.
The by-election was triggered by the death of the serving Conservative Party Member of Parliament (MP), Sir John Blundell Maple.
The main issue in the by-election, as with the Lewisham by-election held on the same day, was tariff reform. Harris was a supporter of Joseph Chamberlain's proposals for Imperial Preference and was supported by the Tariff Reform League. Masterman was a supporter of the Liberal party policy of Free trade. Harris's involvement in the Jameson Raid affair was raised by his opponents.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Frederick Rutherfoord Harris | 5,819 | 57.0 | N/A | |
| Liberal | Charles Masterman | 4,382 | 43.0 | New | |
| Majority | 1,437 | 14.0 | N/A | ||
| Turnout | 10,201 | 75.5 | N/A | ||
| Conservative hold | Swing | N/A | |||