Trade unions
| Full Name | Short Name | Notes |
|---|---|---|
| Professional Footballers Association | PFA | |
| Public and Commercial Services Union | PCS | |
| Public Works and Constructional Operatives' Union | PWCOU | |
| Radio Officers' Union | ROU | Renamed the Radio and Electronic Officers' Union in 1967. |
| Railway Clerks' Association | RCA | Renamed in 1899 from the National Association of General Railway Clerks. In 1951 became the Transport Salaried Staffs' Association, |
| Scottish Horse and Motormen's Association | SHMA | In 1908, renamed from the Scottish Carters' Association. It merged with the Transport and General Workers' Union in 1971. |
| Scottish Miners' Federation | SMF | Formed in 1894. Renamed National Union of Scottish Mineworkers in 1914. |
| Scottish Painters Society | SPS | |
| Scottish Prison Officers' Association | SPOA | |
| Scottish Union of Power-Loom Overlookers | SUPLO | |
| Ship Constructors and Shipwrights' Association | SCSA | |
| Shop Assistants' Union | SAU | Formed in 1898. Also known as National Amalgamated Union of Shop Assistants, Warehousemen and Clerks. In 1946, merged with the National Union of Distributive and Allied Workers to form the Union of Shop, Distributive and Allied Workers. |
| Society of Chiropodists and Podiatrists | SCP | |
| Society of Civil Servants | SCS | |
| Society of Graphical and Allied Trades | SOGAT | merged with NGA in 1991 to form GPMU |
| Society of Lithographic Artists, Designers and Engravers | SLADE | |
| Society of Radiographers | SoR | |
| South Wales Miners' Federation | SWMF | |
| Staff Tutors' Association | STA | |
| The Writers' Guild of Great Britain | WGGB | |
| Transport and General Workers Union | TGWU | |
| Transport Salaried Staffs' Association | TSSA | Formed in 1951. Formerly known as the Railway Clerks' Association. |
| Typographical Association | TA | |
| Undeb Cenedlaethol Athrawon Cymru | UCAC | |
| Union of Construction, Allied Trades and Technicians | UCATT |