Wat Ratchanadda is a Buddhist temple in Bangkok, which is located in the eastern part of the Old City (Phra Nakhon district), overlooking Ratchadamnoen Klang and Maha Chai streets. Construction began on the orders of King Rama III of Thailand in 1846 and completed in the 20th century. The name of the temple means "King's Granddaughter" and is in honor of Princess Somanas Wadhanawaddy.

Wat occupies an area surrounded by a fence, and consists of several buildings. The most notable of these is Loha Prasat, built like a chedi and made of metal. This is the only metal temple building in Bangkok. Loha Prasat is modeled after a now-lost Ceylon temple from the 3rd century BC. e. Of the surviving styles, Prasat is the closest to Burmese. The height of Loha Prasat is 36 m. It consists of four floors, each of which has metal spiers. The total number of spiers is 37, which corresponds to 37 virtues leading to enlightenment. Each floor is a labyrinth in which meditation rooms and spiers are connected by walkways and stairs.

There is a large amulet market on the territory of the wat.