Wat Mongkhon Bophit, also referred to as Wihan Phra Mongkhon Bophit, is a temple standing inside the Ayutthaya Island, merely 500 meters to the south of Wat Phra Sri Sanphet, city of Ayutthaya, central Thailand.

Back in the early days of the Ayutthaya Kingdom, no fixed cremating site was appointed, therefore when a king passed away, his body would be cremated at one place and then one temple was built on the site to commemorate it, except for King Songtham, the ruler between 1611 and 1628, who preserved the temple beforehand as his cremating site. The temple was believed to have been originally built in 1357 AD. It can be seen enshrining a gargantuan bronze statue of sitting Buddha now, but the statue was in fact transferred from Wat Chichang in the year of 1619, under the request of King Songtham. The statue is measuring at 17meters (56ft), as one of the largest bronze Buddha statues across Thailand, said to be forged around late 15th century. During the reign of King Sua, the top of the Mandapa was struck by a lightning and it collapsed. The head of Phra Mongkhon Bophit image fell off. The Mandapa was rebuilt according to the order of the king and as a result turned into a Viharn. Another restoration of the temple was happened during the reign of King Borommakot. During the second fall of Ayutthaya, both the image and the temple were set on fire and underwent devastating damages. In 1955, the Phra Mongkhon Bophit image was restored and in 1990, the Mongkhon Bophit Foundation in Ayutthaya submitted an application to the Fine Arts Department, aiming to launch a work to cover the image with gold leaf. The application was later approved and the work of covering the image with gold leaf was finished in 1992.

Today Wat Mongkhon Bophit is a spectacular tent-shaped structure, with ivory walls and reddish roofs lined with golden eaves and carvings. The giant Buddha statue has long been plated with gold and is rather popular among local pilgrims. The temple is opened to the general public for free, but visitors would be demanded to take off shoes, hats and sunglasses before entering.