Adam Alfred Rudolf Glauer (9 November 1875 – 8 May 1945?), better known under his pseudo-aristocratic alias Rudolf Freiherr von Sebottendorff (or von Sebottendorf) was a German occultist, writer, intelligence agent and political activist. He was the founder of the Thule Society, a post-World War I German occultist organization where he played a key role, and that influenced many members of the Nazi Party.