Ramiro III (c. 961 – 26 June 985), king of León (966–984), was the son of Sancho the Fat and his successor at the age of only five.

Among the acts of his regents during his minority was their ratification of a peace treaty with Caliph al-Hakam II; he also confronted Vikings who had invaded Galicia.

Upon reaching his majority and after his wedding to Sancha (d. after 983), perhaps daughter of Gómez Díaz, Count of Saldaña, Ramiro tried to institute an absolutist monarchy which resulted in the alienation of the already separatist Galicia and Castile.

This, together with the constant routs experienced at the hands of the Muslims, such as the Battle of Rueda, the Battle of Torrevicente and the worst, which took place at San Esteban de Gormaz under the regency of his aunt in 975, led the Galician nobility in 982 to proclaim Bermudo II, son of Ordoño III, king of Galicia.

He had at least one child with his wife, Sancha Gómez, Ordoño Ramírez, who married Cristina Bermúdez, daughter of his rival.