Sigyn is a goddess and wife of Loki in Norse mythology.
Sigyn may also refer to: Sigyn (ship), a wooden barque of 1887, now museum ship in Turku MS Sigyn, a ship that transports spent nuclear fuel from Swedish nuclear power plants to Clab Sigyn, a genus of parasitic isopods in the family Bopyridae Sigyn (Marvel Comics), a fictional character appearing in the Marvel Comics universe 3631 Sigyn, a main-belt asteroid discovered 1987 by E. W. Elst at La Silla Sigyn Glacier, a glacier in Queen Maud Land