The achievement of universal suffrage after 1918 stimulated new forms of democratic participation in Britain. These decades witnessed not only renewed efforts by political parties to mobilize the mass electorate, but also the establishment of new kinds of civic association, often secular in character, strongly invested in a discourse of active citizenship, and committed to creating and defending a space within associational life which was free of partisan or sectarian conflict. This article presents a fresh perspective on the political culture of interwar Britain by comparing and contrasting the experiences of four voluntary associations active during this period: the National Federation of Women's Institutes, Rotary International, the British Legion, and the League of Nations Union. It analyses their relationship with conventional party politics, rejecting the argument that these associations served as vehicles for middle-class anti-socialism, and concludes, instead, that their pluralist values and political centrism formed part of a wider response by political, religious, and educational elites to the challenge of class conflict, economic instability, and political extremism in the post-war decades.