Wat Jan or the "Monastery of the Gold Apple" (1) is a vanished temple formerly located on the city island outside the Historical Park in Ho Ratanachai sub-district.
The monastery was situated between Wat Rong Ma (aka Wat Khok Ma) and Wat Pho Ngam along the old eastern city wall and the Front city Canal. The temple must have been situated near the location of the present Jao Pho Jui shrine (ศาลเจ้าพ่อจุ้ย)
Historical data about the monastery and its construction are unknown.