| Official Name: | Al-Qadisiyah Governorate |
| Other Name: | Al-Diwaniyah Governorate |
| Native Name: | القادسية |
| Mapsize: | 200px |
| Settlement Type: | Governorate |
| Subdivision Type: | Country |
| Subdivision Name: |  Iraq |
| Subdivision Type1: | Capital |
| Leader Title: | Governor |
| Leader Name: | Abbas al-Zamili |
| Subdivision Name1: | Al Diwaniyah |
| Coordinates: | 31.85°N 48°W |
| Population As Of: | 2014 |
| Population Total: | 1320000 (10% of total) |
| Area Total Km2: | 8153 |
| Blank Name Sec2: | HDI (2021) |
| Blank Info Sec2: | 0.678[1] |
| Website: | http://www.diwaniya.gov.iq/ |
Al-Qadisiyah Governorate (Arabic: القادسية,), also known as the Al-Diwaniyah Governorate (Arabic: ٱلدِّيوَانِيَّة,), is one of the governorates of Iraq. It is in the southern part of the center of the country. The estimated population of the province is about a million and a half million people, according to the census of 2014. Its capital is Al Diwaniyah. Before 1976, it was part of the ad-Diwāniyah Governorate, along with al-Muthannā and Najaf. The province is named after the historical city of Al-Qādisiyah, the site of the Battle of al-Qādisiyah, where in 636 CE the Islamic Rashidun forces defeated the forces of the Sassanid Empire. The governorate is predominantly Shia Arab. It includes the Mesopotamian marsh of Hor Aldelmj.
There is one public university known as the University of Qadisiyah, which was founded in the late 1980s, and includes colleges such as nursing, pharmacy, law, literature, education, agriculture, medicine and others. The student population is mostly derived from districts and areas of the province and neighbouring provinces. The university is on the old road leading to the city of Hilla. The technical institute of Al-Qadisiyah is approximately 6 km from the city centre.