Rudbar-e Alamut-e Gharbi District (Persian: بخش رودبار الموت غربی)[a] is located in Qazvin County, Qazvin province, Iran.

[3] According to some sources, the majority of people in northern Qazvin (Alamut) are Tats who speak a dialect of the Tati language.

[4][5][6][7][8][9] However, other sources claim that the majority of people in Alamut are Mazanderani[10] or Gilaks who speak a dialect of the Mazanderani language or Gilaki language.

[17][18][12] At the time of the 2006 National Census, the district's population was 16,255 in 4,667 households.

[20] The 2016 census measured the population of the district as 20,896 inhabitants in 7,272 households.