• Introducing our New Catalogue: PPL Discovery

As of Tuesday April 2, 2024 we will say goodbye to our Syndeo Catalogue. We will switch completely to the PPL Discovery Catalogue instead.

You will then find all the information you need to get started with this new catalogue in the submenu under the tab Catalogue. Because PPL Discovery has been functioning alongside the Syndeo Catalogue for quite some time now, we do not expect too many problems in using this catalogue. However, if you encounter any problems or have any questions, please direct them to library@peacepalace.org

  • Visiting the Library upon Registration

The Library is open: Monday till Friday from 09:00 a.m. - 17:00 p.m. A reservation for each visit, including to just return a book, is compulsory. It is not permissible to return books at the Security Gate.


Reserve a time slot via the online form, prior to each visit. You will receive an email confirmation of your registration which you must show to the Security Officer at the gate of the Peace Palace. Your registration contains your name, your address and the number on the Library Card. We only allow patrons with an active membership of the Library to visit us. If you are a first-time visitor, you will need to register for a Library Card in advance and to show your email confirmation at the security officer at the gate. You will not be granted access to the Library if you have not registered in advance. We kindly request all visitors to arrive at the Security Gate on your scheduled date and time. Upon arrival, you have to present a valid Photo- ID (pass port / EU ID Card), your Library Card and the email confirmation of your registration. The Security Officer is authorized to deny access in case you arrive at a date and time not in accordance with the system.

  • Climate Change and the Testing of International Law

Climate Change and the Testing of International Law: A Selective Bibliography by Ms. Eveline van Trigt And see here for a special page about this bibliography.

  • New Acquisitions Hugo Grotius

The Library has acquired exquisite copies of Hugo Grotius's 'Mare liberum' 1633 (TMD 546) and 'Inleydinge tot de Hollandsche Rechts-Geleertheyt' (TMD 776) at an auction held by Burgersdijk & Niermans, Nieuwsteeg 1, Leiden. These acquisitions are the second and third copies in our collection, respectively. The condition of the books is outstanding!