The Emirate of Córdoba, and from 929, the Caliphate of Córdoba, was an Arab Islamic state ruled by the Umayyad dynasty from 756 to 1031. Its territory comprised most of the Iberian Peninsula (known to Muslims as al-Andalus), the Balearic Islands, and parts of North Africa, with its capital in Córdoba (at the time Qurṭubah). From 756 it was ruled as an independent emirate until Abd al-Rahman III proclaimed himself to be caliph in 929.

The state was founded by Abd al-Rahman I, an Umayyad prince who fled the defeat and persecution of the Umayyad clan in Bilad Al-Sham (Levant) and across the caliphate after the Abbasid revolution. The polity then flourished for the best part of three centuries, before disintegrating in the early 11th century during the Fitna of al-Andalus, a civil war between the descendants of caliph Hisham II and the successors of his hajib (court official), Almanzor. In 1031, after years of infighting, the caliphate collapsed and fractured into a number of independent Muslim taifa (kingdoms).

The period was characterized by an expansion of trade and culture, including the construction of well-known pieces of Andalusi architecture.

The Visigothic Kingdom had ruled Iberia for over two centuries when it was conquered by the Umayyad Caliphate. The Umayyads had previously conducted small raids on the southern tip of Iberia against the Visigoths, but full-scale conquest did not begin until April of 711. An army led by Tariq ibn Ziyad crossed into Southern Hispania from North Africa across the Strait of Gibraltar. After the crossing, Tariq's troops defeated Visigothic forces at the Battle of Guadalete. Roderic, the last king of the Visigoths, was killed, leaving an open path into Hispania. The Umayyads established the Iberian Peninsula as a province (wilāya) of their empire. The rulers of this province established their capital in Córdoba and received the administrative titles wāli or emīr.

In 756, Abd al-Rahman I, a prince of the deposed Umayyad royal family, refused to recognize the authority of the Abbasid Caliphate and became an independent emir of Córdoba. He had been on the run for six years after the Umayyads had lost the position of caliph in Damascus in 750 to the Abbasids. Intent on regaining a position of power, he defeated the existing Muslim rulers of the area who had defied Umayyad and Abbasid rule. Abd al-Rahman I united various local fiefdoms into an independent emirate. The campaigns to unify al-Andalus went into Toledo, Zaragoza, Pamplona, and Barcelona and took over twenty-five years to complete.

Despite the realm's independence from Baghdad, the emirate's rulers used the titles of emir or sultan until the mid-10th century and nominally recognized the suzerainty and legitimacy of the Abbasid Caliphs in Baghdad.

For the next century and a half, his descendants continued to rule as the emirs of Córdoba, with nominal control over the rest of al-Andalus and sometimes parts of western Maghreb. Real control was always in question, particularly over the marches along the Christian border, where power depended on the competence of the individual emir. For example, the power of emir Abdullah ibn Muhammad al-Umawi (c. 900) did not extend beyond Córdoba itself.^{[citation needed]}

Raids increased the emirate's size such as one to Corsica in 806. In 818, the inhabitants of the al-Rabad suburb of Córdoba rose against Al-Hakam I. After the revolt's suppression, the inhabitants were expelled. Some settled in Fez or Alexandria, while others ended forming the Emirate of Crete in the 820s.