Sar Darreh () is a village in Oshnavieh-ye Jonubi Rural District of Nalus District in Oshnavieh County, West Azerbaijan province, Iran.
At the time of the 2006 National Census, the village's population was 302 in 40 households. The following census in 2011 counted 298 people in 78 households. The 2016 census measured the population of the village as 273 people in 58 households.