Tonekabon (Persian: تنكابن, also Romanized as Tonekābon; formerly, Shahsavar (Persian: شَهسَوار), also Romanized as Shahsavār and Shahsawār) is a city in and the capital of Tonekabon County, Mazandaran Province, Iran. At the 2006 census, its population was 43,128, in 13,087 families.