Masal County () is in Gilan province, in northwestern Iran. Its capital is the city of Masal.
At the time of the 2006 National Census, the county's population was 47,648 in 12,328 households. The following census in 2011 counted 52,496 people in 14,984 households. The 2016 census measured the population of the county as 52,649 in 16,901 households.
Masal County's population history and administrative structure over three consecutive censuses are shown in the following table.