Parties
| Full Name | Short name | Notes |
|---|---|---|
| Alliance Party of Northern Ireland | Alliance | |
| Anti-Waste League | AWL | |
| Brexit Party | BRE | Founded in January 2019. |
| British Socialist Party | BSP | |
| British Union of Fascists | BUF | |
| Christian Pacifist | Christian Pacifist | Description of an individual, rather than an organised party |
| Coalition Conservative | Co. Con. | In Coalition government of 1918-1922. |
| Coalition Liberal | Co. Lib. | In Coalition government of 1918-1922. |
| Coalition National Democratic Party | Co. NDP | In Coalition government of 1918-1922. |
| Common Wealth Party | CW | |
| Communist Party | Communist | |
| Communist Workers' Party | CW | |
| Conservative-Liberal | Cons-Lib | |
| Conservative Party | Conservative | |
| Constitutional Conservative | Const. Con. | |
| Constitutionalist | Const | |
| Constitutionalist Party | Const. | |
| Co-operative Party | Co-op. | |
| Democratic Ulster Unionist Party | DUP | |
| Democratic Unionist Party | DUP |