The OCEH has established research networks with other universities and research institutes from Princeton to Sydney. It was part of EurHistXX - European Network of Contemporary History, funded by the French CNRS, which linked a dozen major historical research centres in Europe, and led to the publication of the volume Europe's Postwar Periods - 1989, 1945, 1918: Writing History Backwards, edited by Martin Conway, Pieter Lagrou, and Henry Rousso (Bloomsbury, 2018).
The OCEH encourages international collaboration between research students through annual graduate workshops held in conjunction with the Ecole Normale Supérieure de Cachan, Paris, the Université Libre de Bruxelles, the Humboldt University, Berlin, and the University of Padua, with Geneva University, with Mainz University, and with Sciences Po-Paris. Through the OCEH, the University of Oxford is also involved in the Graduate Conference in European History (GRACEH) Consortium.