Fulk (in French: Foulque or Foulques; 1089/1092 Angers – 13 November 1143 Acre), also known as Fulk the Younger, was Count of Anjou (as Fulk V) from 1109 to 1129, and King of Jerusalem from 1131 to his death. He was also the paternal grandfather of Henry II of England.
Fulk was born in Angers between 1089 and 1092, the son of Count Fulk IV of Anjou and Bertrade de Montfort. In 1092, Bertrade deserted her husband and bigamously married King Philip I of France.
He became count of Anjou upon his father's death in 1109. In the next year, he married Erembourg of Maine, cementing Angevin control over the County of Maine.
He was originally an opponent of King Henry I of England and a supporter of King Louis VI of France, but in 1118 or 1119 he had allied with Henry when Henry arranged for his son and heir William Adelin to marry Fulk's daughter Matilda. Fulk went on crusade in 1119 or 1120, and became attached to the Knights Templar. (Orderic Vitalis) He returned, late in 1121, after which he began to subsidize the Templars, maintaining two knights in the Holy Land for a year.