This is the list of current procurement tender(s) open for proposals in the Preparatory Commission for the CTBTO. Please visit this site from time to time for information on new procurement tenders.

RFP/RFQ No.ITB No. 2019-0035/RAHMAN
Date posted21 March 2019

Supply and Delivery of Non-Seismic Geophysical Equipment – Expansion of Existing Capabilities for Testing and Training Purposes

Invitation to Bid

Closing date10 April 2019
RFP/RFQ No.RFP No. 2019-0032/HASAN
Date posted15 March 2019

Supply of Uninterruptable Power Supplies and Accessories to International Monitoring System Stations and Other Locations, on a Call-off Basis

Request for Proposal

Closing date15 April 2019
RFP/RFQ No.RFQ No. 2019-0028/MAEDA
Date posted12 March 2019

Power Supply, Security Monitoring and Maintenance Work at IS51, Bermuda, UK

Request for Quotation

Closing date02 April 2019
RFP/RFQ No.ITB No. 2019-0024/RAHMAN
Date posted05 March 2019

Supply, Delivery and Installation of CISCO Computer Centre Switches

Invitation to Bid

Clarifications #1

Closing date04 April 2019
RFP/RFQ No.RFP No. 2019-0017/STOMOV
Date posted22 February 2019

Upgrade of Power Supply System at IMS PS34/NRIK Station, Norilsk, Russian Federation

Request for Proposal

Extension to Deadline

Closing date01 April 2019

Additional information

If you are not yet registered with our organization, kindly fill in our Vendor Profile Form (Word Document) and return it either electronically to or via post to Chief, Procurement Section,  CTBTO, Vienna International Centre Wagramerstrasse 5, P.O. Box 1200, A-1400 Vienna, Austria. 

General Conditions of Contract (PDF)

General Conditions of Goods (PDF)

Please note that only requests from registered companies or organizations from CTBTO Member States (PDF) will be considered.

In addition, if you wish to be included in the CTBTO mailing list, please contact the Procurement Section of CTBTO at You will then be informed of new tenders via Email as soon as they are issued.

Use of former Preparatory Commission for the CTBTO (“Commission”) employees in the preparation of Proposals:

A Bidder must not, in the absence of prior written approval from the Commission, permit a person to contribute to, or participate in, any process relating to the preparation of a Proposal or the procurement process, if the person:

a. at any time during the 12 months immediately preceding the date of issue of the Solicitation was an official, agent, servant or employee of, or otherwise engaged by the Commission;

b. at any time during the 24 months immediately preceding the date of issue of the Solicitation was an employee of the Commission personally engaged, directly or indirectly, in the definition of the requirements, project or activity to which the Solicitation relates.