Ušumgallu or Ushumgallu (Sumerian: 𒁔 𒃲ušum.gal, "Great Dragon") was one of the three horned snakes in Akkadian mythology, along with the Bašmu and Mušmaḫḫū. Usually described as a lion-dragon demon, it has been somewhat speculatively identified with the four-legged, winged dragon of the late 3rd millennium BCE.