Ragnvald Roundhead or Ragnvald Knaphövde (king 1125) is only spoken of in the Westgeatish law.

When he had been chosen king at the Stones of Mora, he made the king's binding fare of Sweden (Eriksgata) to be taken on by the tings in the neighbourhood.

However, as he loathed the Geats, he recklessly did not take haftlings from their almightful clans when coming into Westgeatland, and as an aftermath he was slain near Falköping in Westgeatland.