Grasulf I of Friuli

Grasulf I (died after 575) was a nephew of Alboin, the first Lombard King of Italy, and brother of Gisulf, the first Duke of Friuli, whom he succeeded as duke sometime after 575.

A letter written by Gogo, Frankish mayor of the palace of Austrasia under Sigebert I and Childebert II, sometime between Gogo's rise to power in 571 and his death in 581 refers to Grasulf as celsitudo, which historian Walter Pohl interprets as implying that Grasulf held the office. However, negotiations broke down and Grasulf did not align with the Franks or Byzantines. He was succeeded as Duke by his son, Grisulf II around 591.

While the exact location of Grasulf's seat of power is unknown, the letter from Gogo is, evidence that the "Friulian court" was capable of handling sophisticated imperial correspondence not long after the Lombard arrival on Italian soil.