Cadfael ap Cynfeddw (reigned 634–c. 655), also known as Cadfael Cadomedd ('Battle-Shirker'), was a king of Gwynedd.
Little is known about Cadfael's life until after the defeat and death of Cadwallon ap Cadfan at the Battle of Heavenfield in 634. Cadfael seized power in Gwynedd at the expense of Cadwallon's son Cadwaladr, who was still a child. He was an ally of the Mercians under Penda and fought alongside them against the Northumbrians. He participated in Penda's great invasion of Northumbria in 655, but when the two armies met near the river Winwaed, Cadfael and his men withdrew, thus earning him the name Cadomedd.
Cadfael probably did not rule for long afterwards, although his fate is unknown. At some point during the next few years, he was replaced as king, and possibly killed, by Cadwaladr.
