CTBTO Internship Programme

Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO)

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Details checked on 30 October 2026. Dates and amounts change every year. Always confirm on the official page.

Who can apply

Aged 18 to 35 on the start date; excellent academic performance; at least two years of full-time university study completed (you may apply up to two years after a bachelor's, master's or doctorate); excellent written and spoken English; no immediate relatives working for the CTBTO. Interns pay their own travel and living costs and must join the CTBTO group medical insurance unless they have equivalent cover.

Watch: how to apply

About this opportunity

The CTBTO takes interns at its Vienna headquarters on a rolling basis. The stipend is a living-cost allowance and not a salary.

How to apply, step by step

1. Check that you are eligible. Aged 18 to 35 on the start date; excellent academic performance; at least two years of full-time university study completed (you may apply up to two years after a bachelor's, master's or doctorate); excellent written and spoken English; no immediate relatives working for the CTBTO. Interns pay their own travel and living costs and must join the CTBTO group medical insurance unless they have equivalent cover.
2. Note the deadline. Rolling (applications are accepted all year and reviewed at various points; vacancies are posted on the CTBTO website and social media) Confirm the exact date on the official page.
3. Prepare your documents. CV; Cover letter or motivation statement; Proof of current enrolment or recent graduation; Academic transcript; Passport or national ID copy; English-language test result or other language proof (if required); Anything else listed on the official page (this list is a typical checklist - always confirm there).
4. Apply on the official page. Open the official application page and submit your application before the deadline.

Free materials

Templates, checklists and guides to help you apply.

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Tips from our advisors

1. Tailor your CV to the role: lead with the skills and projects the posting asks for.
2. Write a short, specific motivation statement. Name the team or project you want to join and why.
3. Contact potential supervisors before you apply. Send a one-page research summary and a short, specific email.
4. Show a clear link between your past studies, this programme and your career goal. Committees look for a story, not a list.
5. Beyond grades, show leadership and community impact with concrete numbers and outcomes.
6. Ask your referees at least 4 weeks ahead and give them your CV, your draft SOP and the deadline.

Quick answers

Who can apply for CTBTO Internship Programme?

Aged 18 to 35 on the start date; excellent academic performance; at least two years of full-time university study completed (you may apply up to two years after a bachelor's, master's or doctorate); excellent written and spoken English; no immediate relatives working for the CTBTO. Interns pay their own travel and living costs and must join the CTBTO group medical insurance unless they have equivalent cover.

What does CTBTO Internship Programme cover?

An internship of usually three months to one year at CTBTO headquarters in Vienna; eligible interns without other funding may receive a stipend of EUR 500 a month (subject to funds) and up to EUR 500 more for accommodation with a rental agreement

When is the deadline for CTBTO Internship Programme?

Rolling (applications are accepted all year and reviewed at various points; vacancies are posted on the CTBTO website and social media) Dates change every year, so confirm on the official page.

Where can I study or work with CTBTO Internship Programme?

Host countries: Austria.

What documents do I need for CTBTO Internship Programme?

CV; Cover letter or motivation statement; Proof of current enrolment or recent graduation; Academic transcript; Passport or national ID copy; English-language test result or other language proof (if required); Anything else listed on the official page (this list is a typical checklist - always confirm there).

How much work is the CTBTO Internship Programme application?

Medium: Online application (CV + motivation letter)