Rostamabad (Persian: رستم آباد)[a] is a city in the Central District of Rudbar County, Gilan province, Iran, serving as the administrative center for Rostamabad-e Jonubi Rural District.

[4] It is on the Sefīd-Rūd river in the Alborz (Elburz) mountain range.

At the time of the 2006 National Census, the city's population was 11,987 in 3,234 households.

[6] The 2016 census measured the population of the city as 13,746 people in 4,312 households.

[2] Rostamabad has a humid subtropical climate (Köppen: Cfa, Trewartha: Cf), with warm, humid summers and cool, wet winters.