Martin Heinrich Gustav Schwantes (18 September 1881 near Hanover – 1960 in Hamburg) was a German archaeologist and botanist specialist of Aizoaceae (Mesembryanthemaceae).
The Duvensee paddle is the preserved part of a Mesolithic spade paddle, which was found during archaeological excavations of a Mesolithic dwelling area at Duvensee near Klinkrade (Herzogtum Lauenburg) Schleswig-Holstein, Germany in 1926 by Schwantes.
The genus name Schwantesia is in honor of Gustav Schwantes. Astridia is a genus of plant named after Schwantes' wife, Astrid. Lithops schwantesii is a species name given as another tribute.