Sing Buri (สิงห์บุรี) is the provincial capital of Sing Buri Province, in the central region of Thailand.
Sing Buri was a great city in Thai history for the heroic act of the villagers of Bang Rachan in battle. On the west bank of the Chao Phraya River, about 142 km from Bangkok, it has an area of around 841 sq km. Geographically, it is a basin where three rivers, the Chao Phraya, Noi, and Lop Buri, flow through. Somdet Khrom Phraya Damrong Rajanuphab described the city thus, "Sing Buri is an ancient and large city with a fortress, a royal palace, and Wat Maha That". The reclining Chakkrasi Buddha image is larger than others in Thailand. It is an imitation of the Indian Buddha image, like the one at a cave in Yala province. Sing Buri was called by different names: the city of Singha Rachathirat or the city of Singha Racha. The city sits by the Chakkrasi, a large river 200 sen (Thai measurement equivalent to 40 m) away from the Chao Phraya River. Since the Chakkrasi River has been shallow, the city of Sing Buri has become a mysterious city. The city of Sing Buri was established as Sing Buri Province in 1895 during the reign of King Rama V.