Abstract : This research aims at defining relation in the vote of the Portuguese nationals domiciling in Member States of Northern Europe. The citizenship of the europea Union is an opportunity to question electoral practices, political presentations and self-defining memberships of the Portugueses. Having introduced researches relating to Portuguese immigration in Northern Europe, we displayed the methodological choice of the monograph and international comparison (France, Belgium, Luxembourg). From our inquiry, we showed that the electoral behaviour of the Portugueses rests on contextual and individual determiners. Several models of participation were constructed to give an account of diversity and complicacy of the reports of the Portugueses in policy.