- Category : 1864-births
- Type : GP
- Profile : 4/6 - Opportunistic / Role Model
- Definition : Split - Small (20)
- Incarnation Cross : RAX Service 1
German economist and professor, known for teaching on the subject of Anarchism. He taught from 1908 until his death on 12 May 1943 in Freiburg im Breisgau. He taught at the Universities of Heidelberg and Freiberg. His son is Karl Diehl, the German actor.