Saveh County () is in Markazi province, Iran. Its capital is the city of Saveh.
After the 2011 National Census, the village of Aveh was elevated to the status of a city.
At the 2006 census, the county's population was 235,843 in 63,672 households. The following census in 2011 counted 259,030 people in 75,650 households. The 2016 census measured the population of the county as 283,538 in 87,444 households.
Saveh County's population history and administrative structure over three consecutive censuses are shown in the following table.