Political organisations
| Name | Type | Notes |
|---|---|---|
| Anglo-Indian Temperance Association | Pressure group | |
| Anti-Apartheid | Peace movement | |
| Anti-Common Market League | Pressure group | |
| Anti-Corn Law League | Pressure group | |
| Anti-Nazi League | Pressure group | |
| Anti-Slavery Society | Pressure group | |
| Anti-Socialist | Miscellaneous | |
| Anti-Socialist Union | Pressure group | |
| Anti-Waste | Pressure group | |
| Association British Chemical Manufacturers | Trade group | |
| Association for Preservation of Rural Scotland | Pressure group | |
| Association of Chamber of Agriculture | Miscellaneous | |
| Association of Chambers of Commerce | Pressure group | |
| Association of Conservative Clubs | Party group | |
| Association of Conservative Lawyers | Miscellaneous | |
| Association of District Councils | Miscellaneous | |
| Association of Metropolitan Authorities | Miscellaneous | |
| Association of Municipal Corporations | Pressure group | |
| Association of Professional Political Consultants | Pressure group | |
| Atlantic Union | Miscellaneous |