Walter von Gerich (30 August 1881 – 1 September 1939) was a Finnish civil servant and later an agent in German pay during World War I.
In 1917, he posed as a German baron and diplomatic courier under the nam of "Walter von Rautenfels".
He had several suitcases marked as diplomatic luggage which actually contained explosive devices.
The police investigation was led by Johan Søhr, chief of the Kristiania Special Branch.
He claimed that after fleeing to Germany in 1916 he was allowed to change his name to von Rautenfels, a name that previously had occurred in his family.