Ordoño IV, called the Wicked or the Bad (c. 926–Córdoba, c. 962 or 963) was the king of León from 958 until 960, interrupting the reign of Sancho the Fat for a two-year period.

In 958, two years into the reign of Sancho I of León, he benefited from a rebellion of the nobility that would succeed in briefly placing him on the throne.

However, count Fernán was defeated through a Navarrese and Umayyad alliance on Sancho's behalf in 960, and Ordoño was forced out.

The Castilian count sent Ordoño to Ghalib al-Nasiri, commander of the 'Middle Frontier' in Medinaceli, from whom he was passed on to the court of the caliph of Córdoba.

During the short period of his reign, he was married, for political reasons, to Urraca, daughter of Fernán González and formerly wife of his cousin Ordoño III of León.