Jame Mosque of Zanjan, known as Masjed-e Seyyed, belongs to Qajar Period and it is located in the old area of Zanjan. It is among the largest and most beautiful mosques and faith schools in Zanjan. This mosque is one of the valuable buildings constructed according to four-porch mosques. The four porches are constructed on four sides of the mosque symmetrically. On the east and west porches, there are 16 chambers and on the north porch, there are 6 chambers constructed for seminarians. On the north and south porches, some adornments including Banai calligraphy, Mo'ghali tiles as well as seven-color tiles are seen to the artistic style of Qajar Period. Jame Mosque of Zanjan has a massive dome with two walls covered with turquoise tiles and Surah al-Dahr is written in Thuluth Calligraphy that has added to its beauty.