That Sikhottabong, also known as Sikhottabong Stupa is a Buddhist temple in Thakhek, Khammouane Province, Laos. It is contemporary to That Inhang in Savannakhet and That Phanom, built in Thailand under the Sikhottabong Empire. The bones of Lord Buddha are said to be consecrated in these temples. King Nanthasene built the stupa for King Soummitham.
It was refurbished in the 15th century during the reign by King Saysethathirath. The stupa has four squares with each side measuring 25,030 metres (82,120 ft) long and its base is 14.33 square metres (154.2 sq ft) and rises to a height of 29 metres (95 ft). The pinacle appears in the shape of the banana flower. The stupa is seen on the bank of the Mekong River. The festival held at this location is during the third month according to the lunar calendar.