International organizations rely on arbitration to resolve disputes with the contractors, suppliers, and vendors that keep them running. Arbitration is prized precisely because it lets an organization resolve a commercial dispute without submitting to the courts of any single member state — a submission that could otherwise expose it to political pressure or interference.
But arbitration is not as fully insulated from domestic courts as it may appear. Every arbitration needs a “seat” — a designated legal home that determines which country’s courts have supervisory authority over the case. Courts at the seat can rule on interim measures, challenges to arbitrators, and applications to set aside an award. In other words, choosing a seat is not a procedural afterthought. It is a partial, often overlooked, submission to a national court system — precisely the kind of exposure that jurisdictional immunity is meant to prevent.
Why this matters for institutional counsel
Most international organizations resolve commercial disputes through one of two major frameworks: the ICC (International Chamber of Commerce) or the PCA (Permanent Court of Arbitration). The two differ sharply in how they treat this seat question:
- ICC: Treats international organizations as ordinary commercial parties. If the parties haven’t agreed on a seat, the ICC Court can select one — potentially in a jurisdiction with a restrictive view of institutional immunity. Since 2021, the ICC Rules also route any dispute over the administration of proceedings exclusively to the Paris courts, a mandatory nexus that sits awkwardly with an organization’s immunities.
- PCA: Defaults to The Hague as the seat unless the parties agree otherwise, and its rules expressly state that agreeing to arbitration waives immunity from jurisdiction only — not immunity from enforcement of an award. That distinction matters enormously in practice.
This is not a theoretical concern. In 2025, NATO amended its standard arbitration clause to replace the ICC with the PCA as its preferred institution — a signal of where institutional practice is heading.
The enforcement gap
Even a favorable award doesn’t automatically translate into recovery. Immunity from jurisdiction (agreeing to arbitrate) and immunity from execution (allowing assets to be seized) are legally distinct, and international organizations typically retain the latter unless they expressly waive it. Courts have consistently declined to attach assets used for public or institutional purposes, even after recognizing an award. In practice, most organizations comply voluntarily — reputational and relationship risk does more work than enforcement law.
A model worth studying
The ICSID Convention, built for state-investor disputes, offers a useful contrast: it dispenses with a national seat altogether, replacing court supervision with an internal annulment mechanism. It’s not a perfect fit for organizations outside the investment context, but it demonstrates that arbitration can function — and function well — without leaning on domestic courts at all. It may be a useful conceptual model for a purpose-built arbitral regime for disputes involving international organizations.
Takeaway for drafters: the seat clause in an arbitration agreement deserves the same scrutiny as the substantive terms of the contract. Left to a default rule or to a third party’s discretion, it can quietly erode the very immunity the organization sought to protect.
This piece draws on original research and drafting practice in arbitration involving international organizations, including comparative analysis of ICC, PCA, and ICSID frameworks.