This article reviews the literature on the institutional position of national parliaments in the EU. It focuses on new institutional developments, explanations, and effects discussed over the course of the last decade. Existing datasets on parliamentary oversight institutions in EU affairs and economic governance have been extended to 2020 to inform the discussion. A systematic overview of new analyses of the effects of oversight institutions in EU and domestic politics is offered as well. Cutting across the debate as to whether parliaments are multi-level or domestic players in the EU, this review concludes that the last decade has seen growing policy specialization in the institutional position of national parliaments at the European and national levels, and that the causes and consequences of this development remain largely unstudied.