Seoul International School

The school is located at 15, Seongnam-daero 1518 beon-gil, Sujeong-gu, Seongnam-si, Gyeonggi-do, South Korea 13113. The campus is situated just outside Seoul in Seongnam-si, on the southeastern border of Seoul and about 25 minutes south of Lotte World. It comprises three buildings with facilities including a swimming pool, three gyms, a state-of-the-art auditorium, an atrium, music and band rooms, fully equipped science labs, and modern classrooms.

SIS serves PK3 through 12th grade, including JK and SK, with grade groupings that include PK3, JK, SK, 1–5, 6–8, and 9–12. The school is organized into three divisions: Elementary School, Middle School, and High School.

SIS is a private international school. It functions as a private school and operates a day program (boarding is not listed as part of its offerings).

Elementary School provides after-school tutoring and social-emotional support. Middle School offers after-school tutoring and social-emotional support. High School provides academic and social-emotional support, including tutoring, college counseling, and related services.

There is no country-specific affiliation; SIS operates as a secular private international school in South Korea.

SIS has no religious affiliation; it is a secular school.

High School Day: the schedule runs on an A-B rotation with periods from 8:00 to 9:20 (Period 1), 9:20–9:50 (Office Hours), 9:50–11:10 (Period 2), 11:10–11:20 (Break), 11:20–12:40 (Period 3), 12:40–1:40 (Lunch/Activity), 1:40–3:00 (Period 4), and 3:00–5:00 (Sports/Activities). Middle School Day uses an A-B schedule with Period 1 from 8:00–9:20, advisory 9:25–9:50, Period 2 9:55–11:10, Lunch/Recess 11:15–12:10, Period 3 12:20–1:35/1:40, Period 4 1:40–3:00, and Activities 3:00–5:00. Elementary School operates on a rotating A-F schedule with specific lunch and recess time blocks, including PK3–PK4 recess 10:10–10:30 and PK3–2 lunch 10:30–11:00, and other recess/lunch blocks for older grades.

SIS owns and operates a fleet of 21 full-size buses serving the greater Seoul metropolitan area, with routes reaching southern Seoul and even further to Bundang. The buses are fully insured, equipped with two-way radios, and staffed with bus monitors for safety. Routes and schedules are updated at the start of each school year, and the Transportation Office can provide the latest information on routes and seat availability.

Seoul International School provides three levels: Elementary (PK3–Grade 5), Middle School (Grade 6–8), and High School (Grade 9–12). The Elementary Curriculum is inquiry‑based and designed by the faculty; starting in 2019, the Eureka Math program is used for K–5 in alignment with the Common Core standards. Grade 1 Chinese is part of the Elementary program. Middle School emphasizes a caring environment with teacher‑led electives and advisory classes and integrates the United Nations Sustainable Development Goals and the TIGERS Values. The High School offers a university‑bound program with more than 45 courses and 24 AP courses, including the AP Capstone program; classes run four eighty‑minute periods daily with six of eight periods devoted to core requirements. The Science curriculum follows the Next Generation Science Standards and AP science courses; CPM is used in Mathematics. World Languages include Chinese and Spanish, with AP Chinese and AP Spanish and Chinese I–IV/Spanish I–IV; Graduation requirements include Regular Diploma (25 credits) and Honors Diploma (29 credits), including a 2‑credit World Language requirement.

The school offers 24 AP courses including the AP Capstone program. AP Capstone Diploma requirements include completing AP Seminar (Grade 11) and AP Research (Grade 12) and earning a score of 3 or higher on four additional AP exams to receive the diploma.

Graduates are represented in top colleges and universities across North America and worldwide. The school publishes annual highlights and reports that include college acceptances.

AP Capstone and a broad AP program provide advanced study opportunities for high‑achieving students.

The school emphasizes an inquiry-based, collaborative learning culture across all divisions, with explicit focus on developing independent thinkers and global citizens through a community of learners and a supportive, nurturing environment.

Learning supports are described within the Middle School section as part of the program structure, including targeted support for diverse learners within the school's academic pathways.

The High School Academics page lists English coursework from grades 9–12 and AP offerings (e.g., AP Language & Composition, AP Literature & Composition), indicating a strong English-focused program at the upper school.

The elementary philosophy emphasizes a positive, nurturing environment and open communication with parents to support students' social and emotional development.

Safeguarding policies are part of the school's broader institutional framework, with clear channels for student support and a focus on safety and well-being across divisions.

Step 1 – Visit Us. The main admissions season runs January through March, and the 2026-27 application opened on January 9, 2026. The best way to determine if SIS is the right fit is to visit the school; schedule a personal tour by contacting the Admissions Office. If you cannot visit, you may proceed to Step 2. Admissions inquiries are welcome Monday through Friday, 7:30 am–4:30 pm.