{{Infobox royalty
| name = Abd al-Rahman IV
| image =
| succession = Caliph of Córdoba
| birth_date = 1000s
| birth_place = Caliphate of Córdoba
| death_date =
| death_place = Cádiz, Caliphate of Córdoba
| father = Muhammad ibn Abd al-Malik ibn Abd al-Rahman III
| mother =
| reign = 1018
| predecessor = Ali ibn Hammud al-Nasir
| successor = Al-Qasim al-Ma'mun
| dynasty = Umayyad (Marwanid)
| religion = Sunni Islam
}}
Abd al-Rahman ibn Muhammad ibn Abd al-Malik (), commonly known as Abd al-Rahman IV, was the Caliph of the Umayyad state of Córdoba in Al-Andalus, succeeding Ali ibn Hammud al-Nasir in 1018.
On 22 March 1018, Ali ibn Hammud al-Nasir the Caliph of Cordoba was assassinated. Six days later, Ali ibn Hammud's brother, Al-Qasim al-Ma'mun claimed the throne. At the same time, conspirators who had been plotting to overthrow Ali ibn Hammud convinced Abd al-Rahman as the grandson of Abd al-Rahman III to claim the throne. On 29 April 1018, the conspirators proclaimed Abd al-Rahman IV caliph. Shortly thereafter Abd al-Rahman IV was killed in a campaign to capture Córdoba. Therefore, for a short period at the outset of his reign the throne was contested with two individuals claiming to be caliph.