Fulk, also known as Fulk the Younger, was the count of Anjou from 1109 to 1129 and the king of Jerusalem with his wife Melisende from 1131 to his death. During their reign, the Kingdom of Jerusalem reached its largest territorial extent.

The count of Anjou was the ruler of the County of Anjou, first granted by Charles the Bald in the 9th century to Robert the Strong. Ingelger and his son, Fulk the Red, were viscounts until Fulk assumed the title of count. The Robertians and the Capetian kings were distracted by wars with the Vikings and other concerns and were unable to recover the county until the reign of Philip II Augustus, more than 270 years later.