| Abbasa bint Sulayman العباسة بنت سليمان | |
| Succession: | Consort of the Abbasid caliph |
| Zawjat al-khalifa | |
| Reign: | 804 – 809 |
| Reign-Type: | Tenure |
| Spouse: | Harun al-Rashid (m. 803/804) |
| Issue-Type: | Children |
| Full Name: | Abbasa bint Sulayman ibn Abdallah al-Mansur |
| Birth Date: | c. 780s |
| Birth Place: | Baghdad, Abbasid Caliphate |
| Death Date: | 810s |
| Death Place: | Baghdad, Abbasid Caliphate |
| Place Of Burial: | Baghdad |
| Dynasty: | Abbasid |
| Father: | Sulayman |
Abbasa bint Sulayman (ar|العباسة بنت سليمان) was an Abbasid princess, daughter of Sulayman ibn Abi Ja'far, niece of Abbasid caliph al-Mahdi and wife of caliph Harun al-Rashid.
Abbasa was the daughter of Abbasid prince Sulayman and a wife of Caliph Harun al-Rashid She marriage Harun al-Rashid around 803–804.
Her father, Sulayman was a son of the Abbasid caliph al-Mansur and one of his wives, Fatima bint Muhammad, granddaughter of Isa ibn Talha al-Taymi, who was the son of a leading companion of the Islamic prophet Muhammad, Talha ibn Ubaydallah.
Abbasa was related to Abbasid house both by birth and marriage. She was the third and last Abbasid princess who married Harun al-Rashid. His first Abbasid wife was Zubaidah bint Ja'far and second was Umm Muhammad bint Salih.
Her husband, Harun's another wife was Jurashiyyah al-Uthmanniyah. She was the daughter of Abdallah ibn Muhammad, and had descended from Uthman, the third Caliph of the Rashidun.
Abbasa was contemporary and related to several Abbasid caliphs, prince and princesses. Her own children died at very young age, she kept good relations with her step-son children.
| No. | Abbasids | Relation |
|---|---|---|
| 1 | Harun al-Rashid | Husband |
| 2 | Al-Amin | Step-son |
| 3 | Al-Ma'mun | Step-son |
| 4 | Al-Qasim ibn Harun al-Rashid | Step-son |
| 5 | Ali ibn Harun al-Rashid | Step-son |
| 6 | Sukaynah bint Harun al-Rashid | Step-daughter |
| 7 | Hamdunah bint Harun al-Rashid | Step-daughter |
| 8 | Fatimah bint Harun al-Rashid | Step-daughter |