AISZ is a member of the Central Eastern European Schools Association (CEESA).
Many international schools in the central and eastern European region are members of CEESA.
CEESA Activities & Athletics operates as an extension of the CEESA schools and organizes a number of sporting, academic and cultural events at the middle and high school levels. The sports and activities facilitate the development of each student through academic, athletic, and artistic/cultural endeavors. At every activity or competition, CEESA Sports and Activities attempts to maximize the cultural, social and intercultural opportunities available at the host venue.
Students do not need to be on the travel teams in order to participate in these sports; we encourage all students to get involved.
AISZ is also part of the Zagreb School Sports Association and competes in seasonal competitions upon invitation.
School sports in Croatia primarily refer to the student sport activities in schools. Different sports are practiced in different schools depending on the community interests.
The main tasks of school sports association is the cooperation between schools and local and regional self-government units responsible for education and sports, promoting and monitoring the organization of competitions.