The Hasani Palace (Arabic: القصر الحسني, romanized: al-Qaṣr al-Ḥasanī) was the first caliphal palace to be built in East Baghdad, and the main residence of the Abbasid caliphs in the city during the 9th and 10th centuries. As such it formed the nucleus around which a large complex of palaces and gardens emerged, that would be the residence of the Abbasid caliphs until the Sack of Baghdad by the Mongols.