Gregor Ambrosius Gog (1891–1945) was a German anarchist, writer, and activist. He is most known for his founding of the Vagabond Movement, which advocated for the rights of a dissident culture of anarchists, syndicalists, and various other forms of social outcasts during the German Weimar Republic. He also established one of Germany's earliest street newspapers and was regarded as the "King of Vagabonds." His writing defied social norms and highlighted the struggles of the homeless and disenfranchised in the Interwar Period.