[3] It is an international school for students in pre-school - grade 12 incorporated under the laws of the Kingdom of Thailand as a non-profit organization.

Ruamrudee International School (RIS) was founded in 1957 by a group of Redemptorist priests of Holy Redeemer Church with help from expatriate parishioners and a handful of local Thai students after a request by the Thailand Ministry of Foreign Affairs.

RIS is equipped with a 100-meters by 50-meters FIFA-certified artificial turf football pitch, an Olympic sized swimming pool and a normal pool, multiple gymnasiums, two libraries, a performing arts center, multiple mini-theaters, an art gallery, and computer and science labs.

The Griffith Library serves grade 6–12 students, with well over 50,000 books, 70 periodicals, and multiple online resources that span an enormous range of fiction, nonfiction, and reference materials.

The 300-seat, tiered Performing Arts Center (PAC) is where students present their band, choir, drama, and musical productions.

The PAC is a space for showcasing student and faculty talent shows, the annual Easter and Christmas performances, and the TEDxYouth talks.