The taifa of Dénia was a Muslim kingdom in medieval Spain, ruling over part of the Valencian coast and Ibiza. With Dénia as its capital, the taifa included the Balearic Islands and parts of the Spanish mainland.

The taifa was created in 1010, after the disintegration of the Caliphate of Córdoba, by the freed slave Mujahid al-Siqlabi, a former high functionary of the caliphate, who probably had a Slavic origin since Arabs called Slavs as Siqlab/Siqlav. In 1011 Dénia was the first taifa to strike coins. The kingdom had a relatively powerful navy, which in 1015 was used to take control of the Balearic Islands and thence to invade Sardinia. The taifa settled a military camp in the north of the island for one year, as a base for the next attack against the Maritime Republic of Pisa, but it was reconquered by the fleets of Pisa and Genoa: in the fray Mujahid's heir, Ali Iqbal al-Dawla, was captured, and could be ransomed only in 1032. In that period the taifa's ships launched several other raids against the Ligurian and Tuscan coasts.

In the 1020s he took advantage of the death of the regents of the taifa of Valencia to capture the southern part of that kingdom, which he held for two years. A few years later he supported the rebellion of Ibn Jattab against Ibn Tahir of Murcia. After the rise of Abd al-Aziz ibn Amir in Valencia, Mujahid constantly struggled against him, conquering Murcia, Lorca, Orihuela and Elche, extending his power up to the Segura River. Through the mediation of Sulaymán ibn Hud of Zaragoza, he signed a treaty of peace with Valencia in 1041.

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