Ramiro I of Aragon (died 1063), king of Aragon 1035-1063, was the first king of Aragon proper.

He was the natural son of Sancho III of Navarre.

In 1035 he inherited the small valley of the River Aragón (the northwest corner of the modern province of Huesca) with the title of 'king'. After the death of his brother Gonzalo in 1045, he obtained as well the kingdoms of Sobrarbe (the central north strip of the modern province of Huesca) and Ribagorza (the northeast corner of that province).

He died at the siege of Graus .