Osaka International School is the only English-language-based, preK-12, co-educational college-preparatory school in Osaka, Japan's second largest city.

OIS is accredited to teach all three curriculum programmes of the International Baccalaureate Organisation (IBO);

The Primary Years Programme (PYP) for students from Kindergarten to grade 5,

The Middle Years Programme (MYP) for grades 6 to 10 and

The IB Diploma for grades 11 & 12.

Moreover, OIS is unique in sharing its facility and many of its programs with the Senri International School (SIS). SIS offers a six year Japanese-based program in grades 7-12 to meet the needs of children of Japanese expatriates, who return to Japan after living abroad. Together, the 600 students are offered the opportunity to become informed, caring, and creative individuals, developing skills they need to contribute to a global community, and then achieve success in business, education, diplomacy, and the arts.

OIS is accredited by the Western Association of Schools and Colleges and is a member of the Japan Council of International Schools; the East Asian Regional Council of International Schools; and the Council of International Schools. The Senri International School is also accredited by the Japan Ministry of Education.