Concordian International School (Thai: โรงเรียนนานาชาติคอนคอร์เดียน, RTGS: Rong Rian Nana Chat Khonkhodian) is a Pre-K to grade 12 school located in Bang Phli District, Samut Prakan, Thailand.

The school’s name is taken from the Old French concorde and from the Latin concordia, meaning “agreement” or “union”, and also from con, meaning together, and cor meaning heart: literally, "hearts together",[citation needed] Concordian International School offers the full range of International Baccalaureate Organization[1] programmes, including: The school offers the following clubs and activities to students: Concordian International School belongs to the AISAA Sports League.

Concordian students compete regularly in multiple sports, starting in under 7 all the way to senior level in football, basketball, volleyball, swimming, golf, table tennis, badminton, and tennis competitively against other schools.

Concordian has invested more than 400 million baht in extra facilities, including a second swimming pool (50-meter covered swimming pool), 2 extra gymnasiums, 2 new tennis court, 4 squash courts, dance studios, and more.

Concordian International School has 240 full-time teachers, all fully qualified teachers coming from the United States, Canada, Australia, England and for our Chinese section from China and Taiwan.