Sigvatr Þórðarson or Sighvatr Þórðarson or Sigvat the Skald (995–1045) was an Icelandic skald. He was a court poet to King Olaf II of Norway, as well as Canute the Great, Magnus the Good and Anund Jacob, by whose reigns his floruit can be dated to the earlier eleventh century. Sigvatr was the best known of the court skalds of King Olaf and also served as his marshal (stallare), even baptizing his son Magnus.