Wilhelm Guddorf (alias Paul Braun; 20 February 1902 – 13 May 1943) was a Belgian journalist, anti-Nazi and resistance fighter against the Third Reich.

Guddorf was a leading member of a Berlin anti-fascist resistance group that was later called the Red Orchestra (Rote Kapelle) by the Abwehr.

[4][1] He later mastered all the major European and Slavic languages, plus Arabic, Latin, Greek and Hebrew.

[1] From 1933, using his pseudonym, he distributed illegal writings against the Nazi regime and was a member of the KPD district leadership of Berlin-Brandenburg.

[8] The leaflets were produced by the Harnack and Schulze-Boysen Groups and had names like What is a Majority, Freedom and Violence and Call to the workers of the mind and fist not to fight against Russia.

[10] Under torture, Guddorf revealed the names of resistance members in Hamburg to the Gestapo, that lead to the arrest of some 85 people in the North Sea dockyards.