Angkor Wat (/ˌæŋkɔːr ˈwɒt/; Khmer: អង្គរវត្ត, City/Capital of Temples) is a Hindu-Buddhist temple complex in Cambodia. Located on a site measuring 162.6 hectares (1.6 km2; 401.8 acres) within the ancient Khmer capital city of Angkor, it was originally constructed in 1150 CE as a Hindu temple dedicated to the deity Vishnu. It was later gradually transformed into a Buddhist temple towards the end of the century. Considered by some experts to be the largest religious structure in the world, it is regarded as one of the best examples of Khmer architecture and a symbol of Cambodia, depicted as a part of the Cambodian national flag.

Angkor Wat was built at the behest of the Khmer king Suryavarman II in the early 12th century in Yaśodharapura (present-day Angkor), the capital of the Khmer Empire, as his state temple and eventual mausoleum. Angkor Wat combines two basic plans of Khmer temple architecture: the temple-mountain and the later galleried temple. It is designed to represent Mount Meru, home of the devas in Hindu mythology and is surrounded by a moat more than 5 km (3.1 mi). Enclosed within an outer wall 3.6 kilometres (2.2 mi) long are three rectangular galleries, each raised above the next. At the centre of the temple stands a quincunx of towers. Unlike most Angkorian temples, Angkor Wat is oriented to the west with scholars divided as to the significance of this.

The temple complex fell into disuse before being restored in the 20th century with various international agencies involved in the project. The temple is admired for the grandeur and harmony of the architecture, its extensive bas-reliefs and devatas adorning its walls. The Angkor area was designated as a UNESCO World Heritage Site in 1992. The Angkor Wat is a major tourist attraction and attracts more than 2.5 million visitors every year.