Zirtang Rural District () is in Kuhnani District of Kuhdasht County, Lorestan province, Iran. Its capital is the village of Garkhashab.
At the time of the 2006 National Census, the rural district's population was 6,444 in 1,207 households. There were 6,031 inhabitants in 1,376 households at the following census of 2011. The 2016 census measured the population of the rural district as 4,859 in 1,315 households. The most populous of its 39 villages was Nam Kul, with 638 people.