| Honorific Prefix: | Al-Hassāf الحصّاف |
| Abu-Bakr Ahmad Ibn-Amru ash-Shaybani al-Khassaf أبو بكر أحمد بن عمرو الشيباني الخصاف | |
| Region: | Abbasid Caliphate |
| Era: | Islamic Golden Age |
| Parents: | Umar Ibn-Muhair |
| Children: | ibn al-Hassāf |
| Birth Date: | 800s |
| Death Date: | 874 |
| Death Place: | Abbasid Caliphate |
| Religion: | Islam |
| Creed: | Athari |
| Main Interests: | Aqidah, (Islamic theology), Tawhid, Islamic jurisprudence, Ḥiyal |
| Office1: | Qadi of the Abbasid Court |
| Term Start1: | 869 |
| Term End1: | 870 |
| Notable Works: | Author of a seminal work on Qadi, known as Adab al-qadi |
| Known For: | Hanafi law scholar at the court of Caliph al-Muhtadi. |
| Influences: | Abu Hanifa, Muhammad al-Shaybani |
| Denomination: | Sunni |
| Jurisprudence: | Hanafi |
Abu Bakr al-Khassaf (Abu Bakr Al-Ḫaṣṣāf) (died 874, full name Abu-Bakr Ahmad Ibn-Amru ash-Shaybani al-Khassaf)was a Hanafite law scholar at the court of the 14th Abbasid Caliph al-Muhtadi.
He is the author of a seminal work on Qādī, known as Arabic: أدب القاضي Adab al-qādī. A commentary on the work was written by al-Jaṣṣās in the 10th century.An English translation was published by G. P. Verbit in 2008.
Al-Ḫaṣṣāf is also the author of a Kitāb al-ḥiyal wa-l-maḫārij, a work on legalistic trickery or ḥiyal, and a kitāb aḥkām al-awqāf, on religious institutions or waqf.
The earliest development of this field is the Kitāb al-maḫārij fī l-ḥiyal ("book of evasion and trickery") by Muhammad al-Shaybani (d. 805). A more comprehensive treatment is the Kitāb al-ḥiyal wa-l-maḫārijby Al-Khassaf.[1]