Mir Shams ol Din () is a village in, and the capital of, Mir Shams ol Din Rural District in the Central District of Mazandaran province, Iran.
At the time of the 2006 National Census, the village's population was 1,386 in 400 households. The following census in 2011 counted 1,453 people in 485 households. The 2016 census measured the population of the village as 1,436 people in 510 households.