Gregor Thum (born 2 May 1967) is a German-American historian of Central and Eastern Europe from Munich, Bavaria.
There he worked on a Ph.D. thesis about the transformation of German Breslau into Polish Wrocław from 1945 onwards.
Thum held the position of a DAAD visiting assistant professor at the University of Pittsburgh (2003–2008) and DAAD associate professor at the University of Washington (2010–2011).
From 2008 to 2010, he was a Junior Fellow at the University of Freiburg's Institute for Advanced Studies (FRIAS).
In 2007, Thum was awarded the honorary title "Ambassador of Wrocław" by the local edition of Gazeta Wyborcza,[1] prevailing over prominent nominees like Lech Janerka, Marek Krajewski, Maciej Łagiewski, Jan Miodek, and Bogdan Zdrojewski.