Washington International School

The school’s mission is to be an exemplary learning community that is enriched by differences, informed through inquiry, and global in reach. It values international-mindedness, integrity, inclusivity, and curiosity, encouraging students to challenge assertions and think deeply. Language learning is considered a cornerstone of the academic program, serving as a lens for understanding diverse perspectives.

The academic program is structured around the International Baccalaureate (IB) framework, specifically the Primary Years Program (PYP) for Preschool through Grade 5 and the IB Diploma Program for Grades 11–12. The curriculum emphasizes inquiry-based learning, with language study—including French and Spanish immersion in the early years and Mandarin starting in Grade 6—serving as a central component. The program integrates subjects such as mathematics, science, social studies, and the arts through Units of Inquiry.

The school is authorized to offer the IB Diploma Program, and 33% of graduates attend colleges outside the United States. Students are prepared to be bilingual and biliterate, with a strong emphasis on international-mindedness and the ability to act as change agents in a global context.

The school emphasizes an inquiry-based approach, utilizing methodologies from the International Baccalaureate (IB) and Harvard University’s Project Zero to support diverse learning needs. Teachers are trained in these methodologies to foster critical thinking, analysis, and student agency across all grade levels.

The admissions process is tailored by grade level, with all applicants required to submit an inquiry form, an application, and a parent questionnaire. Depending on the grade, requirements may include admissions testing in English and math, language assessments for dual-language programs, applicant interviews, and school visits. Applications are due January 5, with decision notifications typically released on February 27.

The school operates on a structured academic calendar with specific letter days for the Middle and Upper Schools and number days for the Primary School. Outline calendars are available for several years in advance, and the school maintains a comprehensive online calendar for events, parent meetings, and activities.

The school operates on two campuses in northwest Washington, DC. The Primary School (Preschool–Grade 5) in Georgetown features light-filled classrooms, a library with collections in English, French, and Spanish, the Lasseron Design Lab, art and music rooms, and a gymnasium, alongside outdoor playgrounds and fields. The Tregaron Campus (Grades 6–12) in Cleveland Park spans six wooded acres and includes historic buildings, walking paths, and the science-centric Le Centre Brown, which is designed to meet LEED Gold standards.

Students participate in a wide range of activities, including service learning, Model United Nations (WISMUNC), and various athletics programs. The school also offers extended learning opportunities, summer camps, and specialized clinics, such as track clinics, to complement the academic experience.