| Atherton International School (애서튼 국제학교) | |
| Type: | Independent International School |
| Grades: | Year 1 - Year 13 |
| City: | Okpo, Geoje South Gyeongsang Province |
| Country: | South Korea |
| Former Names: | Okpo International School; International School of Koje |
Atherton International School (AIS) is a privately funded international school located in Okpo, Geoje, South Korea. Founded in 2002 as Okpo International School their name changed to The International School of Koje (ISK) in 2014, before gaining its current name in 2022. Currently they are accredited for the IEYC, the International Primary Curriculum and the IMYC as well as IGCSEs and A levels.[1] They are the only school in Geoje that has been approved as an international school by the Gyeongsangnam-do Office of Education.