| Green Mosque | |
| Native Name: | Yeşil Camii |
| Map Type: | Turkey |
| Location: | İznik, Turkey |
| Coordinates: | 40.4297°N 29.7269°W |
| Religious Affiliation: | Islam |
| Architecture: | yes |
| Architect: | Hacı Musa |
| Architecture Type: | Mosque |
| Architecture Style: | Ottoman architecture |
| Groundbreaking: | 1378 |
| Minaret Quantity: | 1 |
| Minaret Height: | 25m (82feet) |
| Dome Dia Outer: | 10.5m (34.4feet) |
Green Mosque (Turkish: Yeşil Camii) is a historic Ottoman mosque in İznik, Turkey.
One of the earliest examples of Ottoman architecture, the Yeşil Mosque was constructed by order of the Grand Vizier Çandarlı Kara Halil Hayreddin Pasha of Sultan Murad I in Iznik. It was later completed by his son Ali Pasha. The inscription on the mosque gives the date of construction as AH 780-794 (1378-1391), and the name of the architect as Haci bin Musa.
The Yeşil Mosque is located near the Lefke Gate on the eastern edge of the city. It is composed of a three-bay portico and a single prayer hall covered with a single dome measuring 10.5m (34.4feet) in diameter. The height of the dome is 17.5m (57.4feet) above the floor, it has four windows and the lower portion of the interior walls are coated with gray marble panels.The mosque has a single minaret in the northwestern corner of the building which is decorated with composed glazed terra-cotta green, yellow, turquoise and dark purple coloured tiles. The colourful tiles minaret gives the mosque its name: Yeşil (green in Turkish).
The mosque was damaged in 1922 by the Greek army during the Turkish War of Independence. The mosque was restored between 1956 and 1969.