Marvdasht County (Persian: شهرستان مرودشت) is in Fars province, Iran. Its capital is the city of Marvdasht.

After the 2006 National Census, the village of Kushkak rose to city status as Ramjerd. Kamfiruz-e Shomali Rural District was separated from Kamfiruz District in the formation of Kor District, which was divided into two rural districts, including the new Garmeh Rural District.

After the 2011 census, the village of Khaniman was elevated to the status of a city. After the 2016 census, the villages of Faruq, Fathabad, and Zangiabad became cities.

At the time of the 2006 census, the county's population was 294,621 in 69,244 households. The following census in 2011 counted 307,492 people in 83,641 households. The 2016 census measured the population of the county as 323,434 in 94,699 households.

Marvdasht County's population history and administrative structure over three consecutive censuses are shown in the following table.

Media related to Marvdasht County at Wikimedia Commons