| Building Name: | Kaj mosque |
| Map Type: | Iran |
| Map Size: | 275 |
| Location: | Isfahan province, Iran |
| Coordinates: | 32.522°N 51.8403°W |
| Religious Affiliation: | Islam |
| Province: | Isfahan |
| Architecture: | yes |
| Architecture Type: | Mosque |
| Architecture Style: | Azari |
| Dome Quantity: | 1 |
| Minaret Quantity: | 0 |
The Kaj Mosque (fa|مسجد جامع کاج) is a historical mosque located in the Isfahan province of Iran, situated 24 km east of Isfahan on the northern bank of Zayandeh Rud. Currently, only some half-ruined walls and a dome remains from the mosque's original structure. It dates back to the Ilkhanid era. Brick is the most important construction material used for this structure. Even the inner decorations are made of bricks. The mosque had probably a minaret in the past, but there is no trace of it now.[1]