Tyrfing was a magic sword in Norse mythology.
Tyrfing or Tirfing may refer to:
Thyrfing, a viking metal band from Sweden Tirfing, an opera by Swedish composer Wilhelm Stenhammar , several ships of the Swedish Navy Super Sonic Strike Missile (3SM) Tyrfing, a missile under development SK Tirfing, a sports club in Harnäs, Sweden
See also Tyrfing Cycle, a collection of Norse legends