Soltaniyeh County () is in Zanjan province, Iran. Its capital is the city of Soltaniyeh.
In 2013, Soltaniyeh District was separated from Abhar County in the establishment of Soltaniyeh County, which was divided into two districts of two rural districts each, with Soltaniyeh as its capital and only city at the time. The village of Guzal Darreh was converted to a city in 2024.
The 2016 National Census measured the population as 29,480 in 9,130 households.
Soltaniyeh County's population and administrative structure are shown in the following table.