Minority nationalism and European integration have co-existed for most of the post-war years, but how exactly have these two different phenomena interacted? This work seeks to answer this question by examining the behaviour of minority nationalist parties to European integration, through exploring the cases of Plaid Cymru, the Scottish National party, the Volksunie and a range of Breton political organizations such as the Parti Autonomiste Breton and Parti pour l'Organisation d'une Bretagne Libre. The author also focuses upon the increasing levels of transnational co-operation between minority nationalist parties, itself a response to European integration. He also offers a comparison of party attitudes and behaviours to European union.