Wat Langka is a wat in Phnom Penh, Cambodia. It is one of the five ancient pagodas in Phnom Penh that was built in 1422. The construction of Dum Dong as a place of refuge for the storage of the Trinity and as a meeting place for Khmer and Sri Lankan monks. As a reminder of this gathering, this pagoda was also called Wat Lanka. Wat Langka is located southwest of the Independence Monument, Sihanouk Blvd. and St. 51.