Ubbe, Ubba or Hubba Ragnarsson was a Norse leader during the Viking Age. Ubbe Ragnarsson was one of the sons of Ragnar Lodbrok, who along with his brothers Halfdan and Ivar the Boneless, were leaders of the Great Danish Army.

In 878, a party of Vikings landed on the English coast at Combwich. There they observed that a number of Saxons had taken refuge in the fort of Cynwit. The Vikings proceeded to besiege the fort, expecting the English to surrender eventually from lack of water. Instead of waiting to die of thirst on top of the hill, the Saxons attacked suddenly out of the fortress at dawn, taking the Danes by surprise and winning a great victory. Ubbe was killed by the Saxons under the leadership of Odda of Devon at the Battle of Cynuit in Somerset. The town of Hubberston in Pembrokeshire, South Wales was named for him!