Political organisations
| Name | Type | Notes |
|---|---|---|
| Workers Film Association | Pressure group | |
| Workers' Temperance League | Pressure group | |
| Workers Travel Association | Miscellaneous | |
| Working Mens' Conservative Association | Party group | |
| Working Womens' Organisations | Miscellaneous | |
| Workmens Peace Society | Peace movement | |
| World Development Movement | Pressure group | |
| YesInverclyde | Miscellaneous | |
| Yorkshire Unitarian Union | Religious | |
| Young Britons Organisation | Pressure group | |
| Young Conservatives | Party group | |
| Young Fabians | Pressure group | |
| Young Ireland Association | Miscellaneous | |
| Young Labour | Party group | |
| Young Liberals | Party group | |
| Young Scots for Independence | Party group | Youth wing of the Scottish National Party |
| Young Socialists | Party group | |
| Young Wales Group | Miscellaneous | |
| Zionist Federation of GB | Religious |