As of 4 October 2024, 173 States are Members of UNIDO. Click here to see the full list of Member States  - this page lists all Member States of UNIDO including their date of membership and date of ratification, acceptance (A), approval (AA) or accession (a) to the Organization.

The date of membership is the date on which the Constitution of UNIDO came into force for each Member State.

Pursuant to article 25, the Constitution entered into force when at least eighty States having deposited instruments of ratification, acceptance or approval had notified the Secretary-General that they had agreed, after consultation among themselves, that it should enter into force. For those States, the Constitution entered into force on that date (21 June 1985).

For States having deposited instruments of ratification, acceptance or approval before 21 June 1985, but not participating in the said notification, the Constitution entered into force on such later date on which they notified the Secretary-General that the Constitution should enter into force for them.

For States having deposited instruments of ratification, acceptance, approval or accession subsequent to the entry into force of the Constitution, it entered into force on the date of the said deposit.