Langur () is a village in Feyziyeh Rural District of the Central District in Babol County, Mazandaran province, Iran.
At the time of the 2006 National Census, the village's population, as Langur-e Pain, was 663 in 162 households. The following census in 2011 counted 1,068 people in 327 households, by which time the village was listed as Langur. The 2016 census measured the population of the village as 1,063 people in 348 households.