| Queen's County (1918 - 1922) |
Constituency of same name also existed 1832-1885. This county became County Laois after 1922. |
| Queen's University of Belfast (1918 - 1950) |
Non-geographic constituency. |
| Rhondda East (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Rhondda West (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Richmond (Surrey) (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Rochester Chatham (1918 - 1950) |
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| Rochester Gillingham (1918 - 1950) |
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| Rother Valley (1918) |
Full name (in Craig 3,4) Yorkshire (West Riding), Rother Valley |
| Rothwell (1918 - 1950) |
Full name (in Craig 3) Yorkshire (West Riding), Rothwell |
| Roxburghshire and Selkirkshire (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Royton (1918 - 1950) |
Full name (in Craig 3) Lancashire, Royton |
| Rutherglen (1918 - 1983) |
Full name (in Craig 3,4) Lanarkshire, Rutherglen |
| Rutland and Stamford (1918 - 1983) |
Full name (in Craig 3,4) Lincolnshire and Rutlandshire (parts of Kesteven and Rutlandshire), Rutland and Stamford |
| Scarborough and Whitby (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 3,4) Yorkshire (North Riding), Scarborough and Whitby. Constituency of same name reformed 1997. |
| Seaham (1918 - 1950) |
Full name (in Craig 3) Durham, Seaham |
| Sedgefield (1918 - 2024) |
Full name (in Craig 3,4) Durham, Sedgefield |
| Sheffield, Hillsborough (1918 - 2010) |
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| Sheffield Park (1918 - 1983) |
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| Shoreditch (1918 - 1950) |
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| Smethwick (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Solihull (1918 - 2024) |
Full name (in Craig 3,4) Warwickshire, Solihull |
| Southall (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| South Ayrshire (1918 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 3,4) Ayrshire and Bute, South Ayrshire |
| Southend-on-Sea (1918 - 1950) |
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| Southwark Central (1918 - 1950) |
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