|Primary inflows||Ing River, Tam River|
|Primary outflows||Ing River|
|Surface area||2.3 km²|
|Average depth||1.7 m|
|Surface elevation||380 m|
Phayao Lake (Thai: กว๊านพะเยา, rtgs: Kwan Phayao, IPA: [kwáːn pʰajaw]) is an semi-natural freshwater lake in northern Thailand. It covers an area of 2.3 km² at an elevation of 380 m. The lake has a mean depth of 1.7 m. The town of Phayao is at the southeast corner of the lake.
The lake is fed by the Ing River, which empties to the north, and to a lesser degree by the Tam River, which empties into the south of the lake. At the east, the lake empties into the Ing River, which then flows to the Mekong. To the south and west of the lakes are rice paddies, at the mouth of the Ing River is marsh area.
The main aquatic plants in the lake are Najas graminea and Ceratophyllum demersum. 22 species of fish are recorded for the lake, most dominant are the artificially introduced Nile Tilapia (Tilapia nilolica) and the climbing perch (Anabas testudineus). Also, 47 bird species were found at the lake in a survey in 1982.
The lake was created in 1939 to improve irrigation in the area. It was added to the list of 61 most important wetland areas on August 1, 2000. There are currently plans to restore the ancient temple Wat Tilok Aram dating back to the end of the 15th century, which was submerged during the construction of the lake.
- "Ministry officials pour water on temple project". The Nation. 2007-06-05.
- "Bt1-billion bid to restore 500-year-old temple runs into legal wall". The Nation. 2007-06-03.
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