The Blue Mosque (Armenian: Կապույտ մզկիթ, Kapuyt mzkit; Persian: مسجد کبود‎ Masjed-e Kabud) is an 18th-century Shiamosque in Yerevan, Armenia. During the Soviet era, the mosque stopped its services and housed the History Museum of Yerevan. Following Armenia's independence, the mosque was renovated with the support from the Iranian government and again started acting as a mosque, mostly for Iranians residing in the country. It is currently the only active mosque in Armenia. The Yerevan region had been under the control of various Muslim rulers since the incursions of Timur in the 14th century. From the early 16th century, and decisively with the 1555 Peace of Amasya, until the course of the 19th century, it had intermittently been a province of Iran (ruled successively by the Safavids, Nadir Shah, Karim Khan Zand and the Iranian Qajar Dynasty), before it fell to neighboring Imperial Russia through the Russo-Persian War of 1826-1828 and the resulting Treaty of Turkmenchay of 1828.

For the mosque's constution, various dates from the mid-18th century are cited in literature. As reported by 19th-century traveller H.F.B. Lynch, the Blue Mosque was commissioned to be built during the reign of Iranian ruler Nadir Shah (1736–47) by Husayn Ali Khan. George Bournoutian names Husayn Ali Khan as the patron of the building, but places his reign in the years 1762-83.According to Vladimir M. Arutyunyan et al. construction started in 1760 and was completed under Husayn Ali Khan in 1764-68.

The building was the main congregational mosque for the city. When Yerevan was captured by Russia in 1827 during the 1826-1828 Russo-Persian War it was, according to the cataster drawn up by the Russians, the largest of its eight functioning mosques. The building consisted of the main prayer hall, a library, and a madrasa with 28 cells, all organised around a courtyard, with the overall complex occupying 7,000 square metres of land. There is a single minaret at the main portal, in keeping with contemporaneous mosques, and there is no evidence that there were more minarets.