Quentin Declève focuses on international litigation and arbitration, as well as on EU and national competition law and international trade law.

International Litigation

Quentin represents clients in litigation before the EU Courts, as well as before the civil and commercial Belgian courts. 

EU Competition

Quentin assists clients in competition cases before the Belgian Competition Authority and the European Commission. 

Trade Law

Quentin also assists clients in anti-dumping proceedings initiated by the EU.

From 2013 to 2015, Quentin worked part-time as a teaching assistant in EU Law for Professors François Van der Mensbrugghe and Nicolas de Sadeleer at Université Saint-Louis in Brussels. 


French, English, Dutch


  • Columbia Law School, LL.M., 2016
  • Brussels School of Competition, LL.M., 2014
  • University of Ghent, Exchange programme, 2011
  • University of Louvain, Master of  Laws, 2011
  • Saint-Louis University (USL), Brussels, Bachelor of Law, 2009


Quentin is the author and editor of the International Litigation Blog (www.international-litigation-blog.com) which offers posts and discussions on developments and hot topics in the field of international litigation and arbitration.

“Fortis’s Settlement: A Comparative Case Study of Securities Class Action Mechanisms in Europe and the United States” (Business Law International, 2017).

Bar admission


Publications and insights

Sign up for updates
    • 26/03/2019
    • News

    Quentin Declève speaks at the III LawTTIP Joint Conference held at King's College London Dickson Poon School of Law

    On 22 March 2019, Van Bael & Bellis associate Quentin Declève spoke at the III LawTTIP Joint Conference, which ran over two days and addressed issues relating to the contemporary challenges affecting EU law, trade agreements and dispute resolution mechanisms. The subject of Quentin's presentation was the role of treaty drafting in making international rulings and decisions by international courts and tribunals enforceable in the EU legal order. During the conference, the President of the Court of Justice of the European Union, Koen Lenaerts, delivered a keynote speech emphasizing the role of preliminary reference and mutual trust in the EU legal order. The conference was jointly organized by the University of Bologna, the Université de Rennes and King's College London. The full programme of the conference is available here.

    Read more
    • 12/03/2019
    • News

    Quentin Declève authors article on the consequences of the Court of Justice's judgment in Achmea

    In its judgment in Achmea, the Court of Justice of the European Union ruled that an investor-State arbitration (ISDS) clause in a bilateral investment treaty (BIT) concluded between two EU Member States is contrary to the principle of the autonomy of the EU legal order (judgment of 6 March 2018, Case C-284/16). In his article, Van Bael & Bellis associate Quentin Declève suggests that the Achmea judgment could have implications for the validity, not only of ISDS clauses in intra-EU BITs, but also of ISDS and applicable law clauses in BITs and other agreements concluded by the EU (or its Member States) with third countries. The article was published (on-line) in the European Papers and is part of a forthcoming issue dedicated to the Achmea judgment. It is accessible here.

    Read more
    • 30/01/2019
    • Articles

    Opinion 1/17 on CETA: Advocate General Bot finds that the investment court system in CETA is compatible with EU law

    On 29 January 2019, Advocate General Bot delivered his long-awaited Opinion (the Opinion) on whether the investment court system (ICS) in Chapter Eight, Section F, of the European Union-Canada Comprehensive Economic and Trade Agreement (CETA) is compatible with European Union (EU) law, in particular with the autonomy of the EU legal order and fundamental rights. The next step in the proceedings before the Court of Justice of the European Union (CJEU), initiated by Belgium following complications in its ratification process, is for the CJEU to deliver its Opinion on the same question. This client alert discusses the key elements of the Opinion and the implications of these CJEU proceedings on the European Union’s common commercial policy and its policy of advocating reform of existing investor-State dispute settlement (ISDS) and the establishment of a multilateral investment court (MIC).

    Read more

Subscribe to our updates

Please select the practice areas you are interested in: *