Dumnagual was the name of several kings of Alt Clut, later known as Strathclyde:

• Dumnagual I of Alt Clut (c. 6th century)
• Dumnagual II of Alt Clut (7th century)
• Dumnagual III of Alt Clut (mid-8th century)
• Dumnagual IV of Alt Clut (9th century)

• Dyfnwal (disambiguation)