Owain Lawgoch, (English: Owain of the Red Hand, French: Yvain de Galles), full name Owain ap Thomas ap Rhodri (c. 1330 - July 1378), is a Welsh soldier who serves in Spain, France, Alsace, and Switzerland.

He leads a Free Company fighting for the French against the English in the Hundred Years' War.

As the last politically active descendant of Llywelyn the Great in the male line, he is a claimant to the title of Prince of Gwynedd and of Wales.