KIS International School (Thai: โรงเรียนนานาชาติเคไอเอส, RTGS: Rong Rian Nana Chat Khe Ai Aet) is a co-educational full International Baccalaureate world school in Bangkok, Thailand, serving students ages 3 to 18.

KIS is located close to the city center in Huai Khwang District, Bangkok, Thailand.

[1][2] KIS was opened in 1998 as Kesinee International School Bangkok, offering Kindergarten and Primary education, with the IB Primary Years Programme.

The school is a member of EARCOS and is accredited by CIS and ONESQA.

KIS has over 800 students ranging from 3 – 19 years of age with a student/teacher ratio of 8:1.