Wat Suthat Thepwararam (Thai: วัดสุทัศนเทพวราราม; Thai pronunciation: [wát sù.tʰât tʰêːp.pʰá.wát.rāː.rāːm]) is a Buddhist temple in Bangkok, Thailand. It is classified as a first-class royal temple, one of ten such temples in Bangkok (and twenty-three in Thailand). It is a temple located within the Inner Rattanakosin area, distinguished by the Giant Swing that stands directly in front of it.

Construction was begun by King Rama I in 1807. The temple was originally called "Wat Maha Sutthawat" (วัดมหาสุทธาวาส) and was built in a grove of Combretum trees. Further construction and decoration were carried out under King Rama II, who personally helped carve the wooden doors, but the complex was not completed until the reign of King Rama III in 1847 or 1848.

The temple enshrines the Buddha image Phra Si Sakyamuni (พระศรีศากยมุนี; RTGS: Phra Si Sakkayamuni), which was transferred from Sukhothai Province. Around the lower terrace of the main base are twenty-eight Chinese pagodas symbolizing the twenty-eight Buddhas of Theravada tradition. Wat Suthat also houses Phra Buddha Trilokachet (พระพุทธไตรโลกเชษฐ์; RTGS: Phra Phuttha Trai Lokkachet) in the ubosot (ordination hall), and Phra Buddha Setthamuni (พระพุทธเศรษฐมุนี; RTGS: Phra Phuttha Setthamuni) in the sala kan parian, the preaching and assembly hall.

In 2005, the temple was submitted to UNESCO for consideration as a future World Heritage Site.

In the early Rattanakosin period, King Phutthayotfa Chulalok (Rama I) ordered the construction of a new temple within the inner city of Bangkok. In 1807 it was given the initial name "Wat Mahasuthawas". The site lay in low-lying land known as Dong Sakae, so the ground was first filled in and then the temple was built. Construction began with the main vihāra, which was intended to enshrine the large Buddha image Phra Si Sakyamuni (commonly called Phra To), transferred from the great vihāra of Wat Mahathat in Sukhothai. However, King Rama I died before the temple had been formally established as a monastery, and it therefore became popularly known as Wat Phra To, Wat Phra Yai, or Wat Sao Ching Cha.

During the reign of King Phutthaloetla Naphalai (Rama II), work on the temple was resumed, and the king himself carved the wooden doors of the vihāra. He too passed away before the project was completed. The construction of the temple was finally brought to completion in 1847, in the reign of King Nangklao (Rama III), who conferred on it the official name "Wat Suthat Thepwararam", although contemporary chronicles record the form "Wat Suthat Theptharam". Under King Mongkut (Rama IV), the principal Buddha images in the vihāra, ubosot (ordination hall), and preaching hall were given harmonized names: Phra Si Sakyamuni, Phra Buddha Trilokachet, and Phra Phuttha Sretthamuni respectively.

Within Wat Suthat Thepwararam stands the royal memorial to King Ananda Mahidol (Rama VIII). His royal ashes were enshrined in 1950 in the decorative cloth panel (pha thip) at the front of the throne base of Phra Si Sakyamuni, and an annual royal merit-making ceremony commemorating the anniversary of his death is held there on 9 June.

The ubosot of Wat Suthat is regarded as the longest ordination hall in Thailand. Its principal image, Phra Buddha Trilokachet, is a Buddha in the Maravijaya (subduing Mara) posture. Both the ubosot and this image date to the reign of King Rama III. The inner walls are covered with mural paintings executed by court artists of that period. The door and window frames are topped with spired pediments in the form of miniature chedis, giving them a distinctive and highly refined appearance.