KIST is affiliated with the following organizations:
 | The IB, founded in 1968 in Geneva, is an organization that administers three curriculum programs for children from 3 to 19 years in schools around the world. KIST is authorized as an IB World School to offer all three programmes: the Primary Years Programme (PYP), the Middle Years Programme (MYP) and the Diploma Programme (DP). To ensure that educational standards are maintained and developed, re-evaluation is required every four or five years. Authorization history January 2002 - PYP authorization received June 2003 - MYP authorization received June 2004 - DP authorization received |
 | The CIS is a non-profit association of international schools and educational institutions that aims to improve international education around the world. KIST has been a regular member of CIS since 2003. |
 | TAIP, founded in 2005, supports international preschools in the Tokyo area in terms of networking, staff development, parent education and publicity. KIST is a founding member of TAIP. |
 | KIST was certified as an authorized educational foundation by the Tokyo Metropolitan Government’s Ministry of Education in July 2000. As an educational foundation, the school is eligible for tax-exempt status. Students are also eligible for concession fares on public transportation. |
 | The PTC is an international organization founded in 1989 that provides professional development opportunities and training for practicing and aspiring leaders in international schools. KIST is an official member of the PTC. |
 | AAIE is a global community for educators that provides a forum for the exchange of ideas and research concerning the field of international education, school leadership and to advance international education through participation with educational institutions and associations worldwide. KIST is an institutional member. |