Wat Prang Luang (Thai: วัดปรางค์หลวง, pronounced [wát prāːŋ lǔaŋ]) is a 14th-century Thai Buddhist temple in Nonthaburi province, and considered the oldest monastery and archaeological site in Nonthaburi and Bangkok Metropolitan Region.

Believing that its location was his residence after the cholera evacuation before the establishment of Ayutthaya Kingdom.

Later in the Rattanakosin period, Vajirananavarorasa, the 10th Supreme Patriarch of Thailand, found that prang (chedi in Khmer-style) was built at the same time as the temple.

A principal Buddha image in Māravijaya attitude has 9 meters (29 ft) width lap named "Luang Pho U-Thong" is enshrined in the ordination hall.

It is considered a sacred Buddha image and is highly revered by Buddhists, both local and outsiders.