Anti Revolutionary Party (Anti-Revolutionaire Partij)
Christian Historical Union (Christelijke-Historische Unie), merger of the Free Anti Revolutionary Party, the Christian Historical Voters' League and the Frisian Christian Historical Union
Freethinking Democratic League (Vrijzinnig Democratische Bond)
League of Free Liberals (Bond van Vrije Liberalen)
Liberal Union (Liberale Unie)
Roman Catholic League of Electoral Associations (Roomsch-Katholieke Bond van Kiesverenigingen)
Social Democratic Workers' Party (Sociaal-Democratische Arbeiderspartij)
