Wat Son Khao (GPS: 17.02415, 99.7044; Thai: วัดซ่อนข้าว ) are the ruins of an ancient Thai Buddhist temple in Sukhothai, Thailand. It is located on the northeastern part of the Sukhothai Historical Park. The ruins today comprises the remains of a viharn (assembly hall) and a chedi (stupa). The stupa appears to be in the lotus-bud design. It is now half broken, with the top missing.