| South Poplar | |
|---|---|
| Former borough constituency for the House of Commons | |
Poplar South in the County of London | |
| 1918–1950 | |
| Seats | one |
| Created from | Poplar |
| Replaced by | Poplar |
Poplar South (strictly South Poplar, although this is an unusual form of official name for a borough constituency) was a parliamentary constituency centred on the Metropolitan Borough of Poplar of the County of London. It returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom.
The constituency was created for the 1918 general election, and abolished for the 1950 general election. It was then largely replaced by a new Poplar constituency.

The Borough of Poplar wards of Bromley Central, Bromley South East, Poplar Cubitt Town, Poplar East, Poplar Millwall, Poplar North West, and Poplar West.
| Election | Member | Party | |
|---|---|---|---|
| 1918 | Alfred Yeo | Coalition Liberal | |
| Jan 1922 | National Liberal | ||
| 1922 | Samuel March | Labour | |
| 1931 | David Adams | Labour | |
| 1942 by-election | William Guy | Labour | |
| 1950 | constituency abolished: see Poplar | ||

| Party | Candidate | Votes | % | ||
|---|---|---|---|---|---|
| C | National Liberal | Alfred Yeo | 8,571 | 49.4 | |
| Labour | Samuel March | 4,446 | 25.6 | ||
| Unionist | Wilfrid T. Allen | 4,339 | 25.0 | ||
| Majority | 4,125 | 23.8 | |||
| Turnout | 17,356 | 48.1 | |||
| National Liberal win (new seat) | |||||
| C indicates candidate endorsed by the coalition government. | |||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | Samuel March | 14,484 | 58.8 | +33.2 | |
| National Liberal | Alfred Yeo | 10,146 | 41.2 | −8.2 | |
| Majority | 4,338 | 17.6 | N/A | ||
| Turnout | 24,630 | 66.5 | +18.4 | ||
| Labour gain from National Liberal | Swing | +20.7 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | Samuel March | 14,537 | 64.8 | +6.0 | |
| Liberal | Harold Heathcote-Williams | 7,899 | 35.2 | −6.0 | |
| Majority | 6,638 | 29.6 | +12.0 | ||
| Turnout | 22,436 | 59.5 | −7.0 | ||
| Labour hold | Swing | +6.0 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | Samuel March | 16,224 | 62.6 | −2.2 | |
| Liberal | Harold Heathcote-Williams | 9,709 | 37.4 | +2.2 | |
| Majority | 6,515 | 25.2 | −4.4 | ||
| Turnout | 25,933 | 67.6 | +8.1 | ||
| Labour hold | Swing | -2.2 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | Samuel March | 19,696 | 64.8 | +2.2 | |
| Liberal | Harold Heathcote-Williams | 7,185 | 23.6 | −13.8 | |
| Unionist | Elliot Marcet Gorst | 3,532 | 11.6 | New | |
| Majority | 12,511 | 41.2 | +16.0 | ||
| Turnout | 30,413 | 63.6 | −4.0 | ||
| Labour hold | Swing | +8.0 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | David Morgan Adams | 16,253 | 57.6 | −7.2 | |
| Liberal | Herbert Leonard M. Jones | 11,965 | 42.4 | +18.8 | |
| Majority | 4,288 | 15.2 | −26.0 | ||
| Turnout | 28,218 | 58.6 | −5.0 | ||
| Labour hold | Swing | -13.0 | |||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | David Morgan Adams | 18,715 | 73.2 | +15.6 | |
| Conservative | Diana Spearman | 6,862 | 26.8 | New | |
| Majority | 11,853 | 46.4 | +31.2 | ||
| Turnout | 25,577 | 55.3 | −3.3 | ||
| Labour hold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | William Henry Guy | 3,375 | 86.2 | +13.0 | |
| Christian Socialist | P.H. Figgis | 541 | 13.8 | New | |
| Majority | 2,834 | 72.4 | −26.0 | ||
| Turnout | 3,916 | 8.5 | −46.8 | ||
| Labour hold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | William Henry Guy | 11,620 | 89.2 | +16.0 | |
| National Liberal | Joan Vickers | 1,403 | 10.8 | −16.0 | |
| Majority | 10,217 | 78.4 | +32.0 | ||
| Turnout | 13,023 | 66.2 | +10.9 | ||
| Labour hold | Swing | ||||