Baroness Gertrud von Puttkamer (Gertrud Freifrau von Puttkamer in German; born Gertrud Günther, 4 April 1881 – 30 September 1944), also known by her nom de plume Marie-Madeleine, was a German writer of lesbian-themed erotic literature and homoerotic poetry.
Her first book, Auf Kypros, sold over one million copies during her lifetime.