Heiðarvíga saga () or The Story of the Heath-Slayings is one of the Icelanders' sagas. It is badly preserved; 12 leaves of the only surviving manuscript were destroyed along with their only copy in the fire of Copenhagen in 1728. The content of that part is only known through a summary written from memory by Icelandic scholar Jón Grunnvíkingur (1705–1779) who wrote down a summary of the saga from memory, which is the only form in which the saga's contents survive today. The saga has been taken by some scholars as possibly among the oldest Icelanders' sagas.