This article lists the Social Democratic Federation's election results in UK parliamentary elections. It also includes the results of its successor, the British Socialist Party.
| Year | Number of Candidates | Total votes | Average voters per candidate | Percentage of vote | Saved deposits | Change (%) | Number of MPs |
| 1885 | 3 | 657 | 219 | 0.0 | N/A | N/A | 0 |
| 1886 | 0 | N/A | N/A | N/A | N/A | N/A | 0 |
| 1892 | 2 | 659 | 330 | 0.0 | N/A | N/A | 0 |
| 1895 | 4 | 3,730 | 933 | 0.1 | N/A | +0.1 | 0 |
| 1900 | 2 | 6,997 | 3,499 | 0.2 | N/A | +0.1 | 0 |
| 1906 | 8 | 18,446 | 2,310 | 0.4 | N/A | +0.2 | 0 |
| Jan 1910 | 9 | 13,479 | 1,498 | 0.2 | N/A | -0.2 | 0 |
| Dec 1910 | 2 | 5,733 | 2,867 | 0.1 | N/A | -0.1 | 0 |
| 1918 | 16 | 71,762 | 4,485 | 0.7 | 13 | +0.6 | 0 |
Elections results
1885 general election
1892 general election
By-elections, 1892–1895
| By-election | Candidate | Votes | % | Position |
| 1895 Walworth by-election | George Lansbury | 347 | 6.8 | 3 |
1895 general election
By-elections, 1895–1900
| By-election | Candidate | Votes | % | Position |
| 1896 Southampton by-election | C. A. Gibson | 274 | 2.4 | |
| 1898 Reading by-election | Harry Quelch | 270 | 3.1 | |
1900 general election
For the 1900 general election, the Social Democratic Federation stood candidates as part of the Labour Representation Committee.
By-elections, 1900–1906
1906 general election
By-elections, 1906–1910
January 1910 general election
December 1910 general election
By-elections, 1910–1918
The Social Democratic Party merged into the British Socialist Party in 1911. Hartley was endorsed by the Labour Party.
1918 general election
| Constituency | Candidate | Votes | % | Position |
| Bradford South | William Hirst | 8,291 | 30.9 | 2 |
| Edmonton | Frank Broad | 3,575 | 25.7 | 2 |
| Glasgow Gorbals | John Maclean | 7,436 | 34.3 | 2 |
| Glasgow Tradeston | James D. MacDougall | 3,751 | 19.4 | 2 |
| Great Yarmouth | William McConnell | 1,845 | 12.8 | 3 |
| Greenock | Fred Shaw | 2,542 | 11.2 | 3 |
| Grimsby | Charles E. Franklin | 9,015 | 33.7 | 2 |
| Hastings | Joseph George Butler | 3,556 | 24.1 | 2 |
| Islington North | John Arnall | 4,000 | 19.3 | 2 |
| Motherwell | Walton Newbold | 4,135 | 23.2 | 3 |
| Portsmouth Central | Hugh Hinshelwood | 4,004 | 19.1 | 3 |
| Salford South | James Gorman | 3,807 | 19.0 | 2 |
| Sheffield Central | Robert George Murray | 643 | 4.0 | 3 |
| Sheffield Park | Alf Barton | 3,167 | 20.4 | 2 |
| Southampton | Tommy Lewis | 7,828 | 10.6 | 4 |
| Walthamstow West | Valentine McEntee | 4,167 | 29.3 | 2 |
All candidates other than Arnall, Hirst and Murray stood for the Labour Party. Hirst stood for the Co-operative Party.
References
- Martin Crick, The History of the Social Democratic Federation, pp.330-332
Election results by political party in the United Kingdom |
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| Northern Ireland | |
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Template:Election results in the United Kingdom |