Waldemar von Wasielewski (10 December 1875 – 28 February 1959) was a German writer who specialized in the occult, Goethe research, and the history of music.
His father, Wilhelm Joseph von Wasielewski (1822–1896), was a prominent violinist, conductor and music editor.
As a freelance writer, his efforts fell on music historical themes, Goethe, and especially the occult.
His first encounters with the field of occultism may be dated to 1912, primarily to the symptoms of telepathy reported in Sir Oliver Lodge's book The Survival of Man.
In 1916 Wasielewski married Maria von Bloedau (1883–1963), whose mediumship led him to deepen his telepathic studies.