Abstract While gender equality has been a matter of some concern for EU law and policy makers over the past half century, this concern has tended, at least historically, to focus upon equal treatment in employment and has not yet materialised into the delivery of a broader package of civil, political, and social rights for women. Taking the concept of EU citizenship as a framework within which to view the promotion of gender equality, this article assesses the debate on the constitutional future of the EU. This is with a view to examining the possible amelioration of women's social position through the exploitation of opportunities that the constitutionalisation of EU law presents. Looking at women's citizenship through the lens of political rights to participate in the debate on the EU's future, together with examining substantive aspects of the Constitutional Treaty for their gender equality content, the article suggests that a more comprehensive endeavour by all institutional actors to engage in gender mainstreaming is needed in order to give effect to a broader form of equality between women and men.