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.

Date posted27 July 2021

Procurement of PTS Linux Servers

Invitation to Bid

Price Schedule Form

Closing date27 August 2021
RFP/RFQ No.RFP No. 2021-0084/APYLOV
Date posted26 July 2021

Downtime Analysis and Station Equipment Failure Statistics for IMS Stations, on a Call-off Basis

Request for Proposal

Closing date19 September 2021
RFP/RFQ No.RFQ No. 2021-0080/BOVE
Date posted14 July 2021

Supply and Delivery of Ruggedized Field Laptop Computers and External Hard Drives for the International Monitoring System (IMS)

Request for Quotation

Closing date09 August 2021
RFP/RFQ No.RFQ No. 2021-0082/JIBRIL
Date posted13 July 2021

Hardware Refreshment of Web Filtering Devices

Request for Quotation

Clarification #1

Closing date27 July 2021
RFP/RFQ No.RFP No. 2021-0071/JIBRIL
Date posted21 June 2021

Provision of Software Engineering Services for Geophysical Applications, on a Call-off Basis

Request for Proposal (sealed electronic proposals)

Format for Financial Proposal


Closing date30 July 2021

Ethical Standards

The Commission requires its staff members, as international civil servants, to adhere to the highest standards of ethics and integrity in carrying out their duties.  The solicitation or acceptance of any gratuity, gift, favour, entertainment, loan or anything of value from suppliers who conduct business with the Commission is strictly prohibited.
Suppliers that wish to work with the Commission or already conduct business with the Commission are required to adhere to the UN Supplier Code of Conduct and any other ethical requirements as outlined in the Commission’s solicitation and/or contractual documents.

Additional information

If you are not yet registered with our organization, kindly fill in our Vendor Profile Form (PDF) 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.