Heydarieh mosque of Qazvin is a building in the city of Qazvin in Iran. Although renovated by Amir Khomär-täsh (Malikshah's vizier) after the earthquake of 1119 CE, the history of construction of this edifice goes back to pre-Islam, where it was a Zoroastrian fire temple. The building today sits in the yard of an elementary school, and functions as the school's library and auditorium.
