| Al-Musta'sim Billah Mosque | |
|---|---|
 The grave of the last Abbasid Caliph, al-Musta'sim, inside the mosque | |
| Religion | |
| Affiliation | Sunni Islam |
| Province | Baghdad Governorate |
| Location | |
| Location | Adhamiyah, Baghdad, Iraq |
  Shown within Iraq | |
| Geographic coordinates | 33°22′17″N 44°21′48″E / 33.3714557°N 44.3632855°E |
| Architecture | |
| Style | Modern, with elements from Abbasid architecture |
| Completed | 2005 (current structure) |
| Specifications | |
| Capacity | 200 worshippers |
| Dome(s) | 1 (shrine) |
| Minaret(s) | 1 |
| Minaret height | 30 metres |
The Al-Musta'sim Billah Mosque (Arabic: مسجد المستعصم بالله), formerly the Abu Rabi'ah Mosque, is an Islamic mosque and shrine located in the district of al-A'dhamiyya in Baghdad, Iraq. A historic structure renovated in modern times, it contains the tomb of the last Abbasid Caliph, al-Musta'sim. It was also known as Mashhad al-Wu'ud, before it became a mosque.