Ramiro I (c. 790 ??1 February 850) was King of Asturias from 842 until his death. He was son of King Bermudo I, and became king after the struggle for succession that followed the death of Alfonso II, who died without issue.

Ramiro was a contemporary of Abd ar-Rahman II, Umayyad Emir of C籀rdoba. During his turbulent reign, the chronicles relate that he had to fend off attacks from both Vikings and Moors.