Contact Us

Thank you for contacting the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO). To route your query to the appropriate office, please choose the inquiry type from the list below.

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

POSTAL ADDRESS

CTBTO Preparatory Commission Vienna International Centre PO Box 1200 1400 Vienna, Austria

Phone: +43 1 26030-0