| Abu'l-Qasim Ahmad al-Mustansir أبو القاسم أحمد المستنصر | |
|---|---|
| 1st Caliph of Cairo | |
| Tenure | 13 June 1261 – 28 November 1261 |
| Predecessor | Al-Musta'sim (as Abbasid caliph in Baghdad) |
| Successor | Al-Hakim I |
| Born | 1210s Baghdad, Iraq |
| Died | 28 November 1261 Fallujah, Hit, Iraq |
| Father | al-Zahir |
| Mother | Hayat |
| Religion | Sunni Islam |
Abu'l-Qasim Ahmad al-Mustansir (Arabic: أبو القاسم أحمد المستنصر; c. 1210 – 28 November 1261) was the first Abbasid caliph to rule in Cairo and who was subservient to the Mamluk Sultanate. He reigned from June 1261 to 28 November 1261.