Otto Sigfrid Reuter (2 September 1876 – 5 April 1945) was a German writer and organiser who was central in the neopagan current within the völkisch movement. He founded some of the earliest organisations for Germanic neopaganism, which were rooted in the racial ideologies of the völkisch movement. Reuter promoted a decentralised version of pagan practice without priests, in contrast to the hierarchically structured of Ludwig Fahrenkrog.