Max Planck Institute for Comparative Public Law and International Law Logo Max Planck Institute for Comparative Public Law and International Law


A key research tool is the library which holds 675,000 volumes and offers access to more than 28,000 journals and periodicals. In the areas of public international law, European Union law and comparative public law, the library is the largest in Europe and one of the most comprehensive in the world. Researchers from all over the world are welcomed as guests and invited to use the services of the library.


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Coronavirus Update - Urgent


In view of the increasing number of infections and the further spread of the coronavirus worldwide and also in Germany, we are obliged to contribute to containing the spread of coronavirus infections with preventive measures.

The library will be closed to the public from Monday, March 16, 2020 until further notice and will only be accessible to staff members of the Institute and visiting researchers already present in Heidelberg and approved by the library.
New users are currently not admitted.

From Monday, March 23, 2020 until Friday, April 17, 2020 the loan desk (ground floor) and all (three) reading rooms in the Institute will be closed. The services of the loan desk will be discontinued for the time being. We ask for your understanding and hope to be able to return to normal operation soon.

No new visiting researchers will be admitted to the Institute until further notice. Applications will be rejected. Visiting researchers who are already present at the Institute, as well as our staff, can continue their research activities and their work in all other services of the Institute.

The work of the MPIL will be reduced to a minimum but the Institute will not be shut down. It is currently not foreseeable how long these measures will remain in force. We reckon with duration until the end of the Easter vacations (Friday, April 17). 

Opening hours

of the reading rooms

1. April - 31. October:

Monday - Friday 08:30 - 21:00
Saturday 10:00 - 19:30


1. November - 31. March:

Monday - Friday 08:30 - 19:00
Saturday 10:00 - 13:00


service times
(all year round)

Monday - Friday 10:30 - 16:00


Initial personal registration at the Library is only possible within the service times