The Washington Convention, formally the Convention on the Settlement of Investment Disputes between States and Nationals of Other States, was opened for signature on 18 March 1965 and entered into force on 14 October 1966. It was drafted under the auspices of the World Bank and created the International Centre for Settlement of Investment Disputes (ICSID), headquartered in Washington, D.C. at the Bank's offices.
The Convention's central innovation is depoliticised dispute settlement: it allows a foreign investor to bring a claim directly against a host state before an international arbitral tribunal, bypassing both domestic courts and diplomatic protection by the investor's home state. Under Article 27, once a dispute is submitted to ICSID, the investor's home state is barred from espousing the claim through diplomatic channels.
Jurisdiction under Article 25 requires three elements: (i) a legal dispute arising directly out of an investment, (ii) between a Contracting State and a national of another Contracting State, and (iii) written consent of both parties. Consent is typically given in advance through investment contracts, national investment laws, or — most commonly today — bilateral investment treaties (BITs).
Awards rendered under the Convention are notable for their finality. Under Article 53, they are binding and not subject to appeal except through the Convention's own limited annulment procedure (Article 52). Under Article 54, each Contracting State must recognise an ICSID award as if it were a final judgment of its own courts, making enforcement substantially easier than under the New York Convention.
The treaty has been widely ratified, with over 150 states parties. Notable withdrawals include Bolivia (2007), Ecuador (2009), and Venezuela (2012), all citing concerns about investor-state arbitration's impact on regulatory sovereignty. The Convention remains the backbone of the contemporary investor-state dispute settlement (ISDS) regime, though it faces ongoing reform debates at UNCITRAL Working Group III.
Example
In 2012, Venezuela formally denounced the Washington Convention after a series of ICSID claims by oil and mining companies, including ExxonMobil and ConocoPhillips, over nationalisations.
Frequently asked questions
A national (individual or company) of one Contracting State can bring a claim against another Contracting State, provided both have consented in writing to ICSID jurisdiction over the dispute.
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