Diwaniya or ( Al-Diwaniyah ) is the capital city of Iraq's Al-Qādisiyyah Governorate. Its population was estimated at 440,927 In 2002 . The area around Al Diwaniyah, which is well irrigated from the nearby Euphrates river, is often considered to be one on the most fertile parts of Iraq, and is heavily cultivated. The town is located on the main rail transport corridor between Baghdad and Basra.

For birdwatchers, Al-Diwaniyah is a city with a rich bird list, as the city has a wide range of biodiversity. Al-Qadisiyah consists of vast agricultural areas, wetlands, arid zones, and semi-desert areas.

The town is the site of a tire manufacturing plant that once provided tires for much of Iraq. The plant is currently active.