The Imamzadeh Hossein (also Emamzadeh-ye Hossein, Persian: مسجد جامع عتيق قزوین) is the grave mosque of Imamazadeh Husayn, son of the 8th Imam Ali al-Rida ("Hazrat-e Reza") in Qazvin, Iran that the Safavids - Shah Tahmasp I built in the mid-16th century as a pilgrimage center.

The namesake of the tomb is the biennial deceased son of Imam Ali al-Rida. This passed in transit with his father to Khorasan in Qazvin in 821 and was buried at the site. Later more people were buried from the Safavid dynasty bib.

The tomb is reminiscent of a generous palace complex with its own walled garden, plant rows, small Iwanen, niches, grave stones and precious blue and cream-colored tile decorations. The facade of the main gate is of six ornamental minarets surmounted. Is the main gate by steps, there is a large courtyard opens. Directly behind the gate is a pavilion-like, octagonal fountain house.

The tomb is covered by a blue-yellow tiled dome. The central portion of the building is decorated with numerous mirror mosaics; the mirror mosaics of the vestibule and the tiles of the facades date from the 19th century. In this middle part carried by slender columns porch leads to areas segregated by sex and has two entrances; left for women, right for men. The building may only be entered without shoes. Tschadorpflicht

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• Iranian architecture
• History of Iran