| Abd al-Rahman IVArabic: عبد الرحمن المرتضى | |
| Succession: | Caliph of Córdoba |
| Birth Date: | 1000s |
| Birth Place: | Caliphate of Córdoba |
| Death Date: | c. 1018 |
| Death Place: | Cádiz, Caliphate of Córdoba |
| Father: | Muhammad ibn Abd al-Malik ibn Abd al-Rahman III |
| Reign: | 1018–1018 |
| Predecessor: | Sulayman ibn al-Hakam |
| Dynasty: | Umayyad |
| Religion: | Sunni Islam |
Abd al-Rahman ibn Muhammad ibn Abd al-Malik (Arabic: عبد الرحمن بن محمد بن عبد الملك|translit=ʿAbd al-Raḥmān ibn Muḥammad ibn ʿAbd al-Malik), commonly known as Abd al-Rahman IV, was the Caliph of Córdoba in the Umayyad dynasty in Al-Andalus, succeeding Sulayman ibn al-Hakam, in 1018.[1] That same year, he was murdered at Cadiz while fleeing from a battle in which he had been deserted by the very supporters which had brought him into power. His brief reign was similar to that of Abd al-Rahman V
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