International Centre for Settlement of Investment Disputes (ICSID)

What is ICSID and what does it do?

ICSID is the world's leading institution devoted to international investment dispute settlement. States frequently designate ICSID as a forum for investor-State dispute settlement in bilateral and multilateral investment treaties, investment laws and investment contracts.

ICSID does more than provide a physical venue. Its Secretariat administers cases from registration through conclusion, supports tribunals, commissions and committees, maintains the official record, handles case finances, assists with hearings and publishes case information in accordance with the applicable rules.

The Centre also provides administrative services for certain proceedings conducted under non-ICSID rules, including arbitrations under the UNCITRAL Arbitration Rules.

ICSID Member States

The original page's 2016 membership figure is outdated. ICSID's Caseload Statistics 2026-1 reported that, as of 31 December 2025, there were 158 Contracting States and 7 additional Signatory States to the ICSID Convention. ICSID also maintains an official list of Contracting States and other signatories updated in August 2026.

A State becomes bound by the ICSID Convention after signature, ratification and entry into force in accordance with the Convention. Membership gives States and qualifying nationals access to the Convention system, while the Additional Facility can extend ICSID administration to certain disputes outside Convention jurisdiction.

ICSID governance: Administrative Council and Secretariat

The earlier statement that Member States elect both a "Director General" and "Deputy Director General" was incorrect. The Convention provides for a Secretary-General and one or more Deputy Secretaries-General.

When does the ICSID Convention apply?

Article 25 of the ICSID Convention gives the Centre jurisdiction over a legal dispute arising directly out of an investment between a Contracting State (or qualifying constituent subdivision or agency) and a national of another Contracting State, where the parties have consented in writing to submit the dispute to ICSID.

ICSID proceedings are therefore consent-based. A State's membership in the Convention by itself does not mean that every investor can automatically bring a claim. Consent commonly appears in an investment treaty, investment law, contract or other written instrument.

Current ICSID Rules and Regulations - effective 1 July 2022

ICSID completed its most extensive rules amendment in 2022. The current framework took effect on 1 July 2022 and contains four principal sets of procedural materials:

The 2022 reforms modernized and streamlined procedure, expanded the use of electronic filing, strengthened transparency provisions, addressed third-party funding, introduced security-for-costs rules and broadened the scope of the Additional Facility.

ICSID Additional Facility

The Additional Facility is broader than the older page described. Under the 2022 Additional Facility Rules, ICSID may administer certain investment arbitrations or conciliations when one-or in specified situations neither-of the relevant States has the Convention membership link required for Convention arbitration. It can also cover disputes involving certain regional economic integration organizations (REIOs).

The ICSID Convention itself does not apply to Additional Facility proceedings. Recognition and enforcement of an Additional Facility award therefore depend on the law of the seat of arbitration and applicable treaties rather than the special enforcement mechanism in Article 54 of the ICSID Convention.

Recognition and enforcement of ICSID Convention awards

The ICSID Convention creates a distinctive enforcement system. Under Article 53, an award is binding on the parties and is not subject to appeal or other remedies except those provided by the Convention. Under Article 54, each Contracting State must recognize the award as binding and enforce its pecuniary obligations as if the award were a final judgment of a court in that State.

Post-award remedies under the Convention include specified procedures such as interpretation, revision and annulment. Annulment is not an ordinary appeal on the merits; it is available only on the limited grounds stated in Article 52.

Where can ICSID proceedings take place?

ICSID is headquartered in Washington, D.C., but proceedings need not be physically conducted there. Hearings may take place virtually or at other locations agreed by the parties and tribunal, including facilities made available through institutional cooperation arrangements.

Accordingly, the older fixed list of alternative hearing venues has been removed because it can become outdated and may wrongly imply that proceedings are limited to those locations.

ICSID caseload and current statistics

ICSID's caseload is significantly larger than the historical figures previously shown on this page. In fiscal year 2025, ICSID administered a record 347 cases, registered 67 new cases and concluded 81 proceedings.

ICSID registered its 1,000th case on 8 August 2024. By the end of June 2025, the total number of registered cases under the Convention and Additional Facility Rules had reached 1,058; by 31 December 2025, the total was 1,085.

Of the 67 cases registered in FY2025, 60 were Convention arbitrations, six were Additional Facility arbitrations and one was a Convention conciliation. ICSID also provided services in proceedings governed by non-ICSID rules, including UNCITRAL cases.

Research, publications and knowledge services

ICSID publishes the ICSID Review-Foreign Investment Law Journal, caseload statistics, annual reports, procedural guidance and materials on investment law and dispute settlement. It also maintains databases of cases and Member States and provides training and technical assistance concerning investment-dispute procedures.