Ruamrudee International School, Ratchapruek Campus (RISR)

RIS Ratchapruek is the sister campus of Ruamrudee International School, set up to give families on the west side of Bangkok an RIS education without the long trip to the main campus in Min Buri. It sits on Bang Kruai-Sai Noi Road in Nonthaburi and opened in August 2019, starting with Pre-K to Grade 5 and following the main school's curriculum.

The campus has since grown to Pre-K to Grade 12, with a US high school programme, AP courses and the IB Diploma. It is still much smaller than the main campus, with only a few dozen students in the upper grades, which suits families who want a close community but means fewer course and team options in high school.