Lavasan ( Persian: لواسان‎ Lavāsān ) is a city in Shemiranat County, Tehran Province, Iran. At the 2011 census, its population was 28,558, in 7,645 families. Lavasan is the capital of Lavasanat District. The Lavasanat District has one city and two rural districts. The Jajrood River flows through Lavasan. It is home to many upper-class and wealthy families.