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International School of Boston

United States, Boston

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The school at a glance
Instructs in French, English
Fees $29,500 - 51,260
Ages 2 - 18 years
Pupil numbers 575
Type Co-educational
Opened 1962
Bus Service Yes
Academic offering
Curriculum IB (MYP), IB (DP), Bespoke Curriculum, French Curriculum
Taught languages English, French, Spanish, Mandarin, German
Strengths Sport, Visual and Creative Arts, Languages
Clubs Arts and Creative, Cultural and Language, Community and Service
Stages Preschool, Kindergarten, Elementary, Middle School, High School
Introduction

International School of Boston is an independent, non-profit day school in Cambridge, Massachusetts, educating ages 2 to 18. The historic Cambridge campus at 45 Matignon Road anchors the school's facilities, including dedicated libraries for each division, a large gym, a Media Center, two playgrounds, shared outdoor fields, and spaces for visual and performing arts. The curriculum spans IB (MYP and DP) and French and American programs, with two internationally recognized diplomas offered: the French Baccalaureate and the IB, taught in English in Upper School. From Maternelle through Upper School, instruction is bilingual in French and English. Maternelle blends the French Ministry of Education framework with Massachusetts preschool standards; Lower School is accredited by the French Ministry of Education. Middle School is bilingual with options to emphasize either language and to pursue IB or Baccalaureate tracks. Upper School students choose between the French Baccalaureate or IB, with language options in Spanish, German, and Mandarin.

45 Matignon Rd, Cambridge, MA 02140, United States

The Essentials

International School of Boston has 575 pupils, instruction in French, English.

Location

ISB is located at 45 Matignon Road, Cambridge, MA 02140. The historic Cambridge campus sits at the Cambridge–Somerville–Arlington border, minutes from downtown Boston. MBTA bus stops are within walking distance and two nearby Red Line stations (Alewife and Davis Square) are accessible on foot. ISB provides two bus options: its Private Bus Service and Cambridge Public Schools bus service for Cambridge residents.

Stages

Preschool through Grade 12

Type

Independent, non-profit private day school

Pupil Nationality Mix

Total nationalities represented: 32. Nationality breakdown: United States 68%, France 23%, other nationalities 9%.

Additional learning support

ISB provides Inclusive Learning and related student support services, including guidance, advisory programs, and access to health and wellness resources.

Country affiliation

France (French Baccalaureate program homologué by the French Ministry of Education; ISB is connected to AEFE and related French education networks)

School day structure

Upper School schedules start at 8:00 AM and end between 3:30 PM and 5:30 PM, depending on course selection.

Bus service

ISB offers two private bus routes via a transportation partner; Cambridge Public Schools bus service is available for Cambridge residents; campus is served by MBTA bus lines 87, 88, and 89 and is near Alewife and Davis Square stations.
Diving Deeper

Boarding Arrangements

Homestay Program for international students in Grades 9 through 12; students stay with local families for the duration of their enrollment; fee-for-service arrangement.

Uniform Requirement

Students do not have to wear uniforms, but each division has its own dress code.

Food Options

Lunch is provided by an outside food vendor; all students have a full hour for lunch and recess every day; students may bring their own lunch; families are responsible for providing snacks.

Governance and Ownership

Governance is by a Board of Trustees.
Fees

Annual tuition at International School of Boston ranges from USD 29,500 to USD 51,260 for 2026/27.

Annual tuition by grade (2026–2027 academic year)
- Half-Day Preschool (Toute Petite Section and Pre-K only, mornings only): USD 29,500.
- Preschool (TPS, Pre-K, Mid-K) and Kindergarten: USD 36,880.
- Lower School (Grades 1–5): USD 40,770.
- Middle School (Grades 6–8): USD 43,000.
- Upper School (Grades 9–12): USD 51,260.


Application / admission charges
- Matriculation fee (one-time, non-refundable, not applied toward tuition): USD 2,000 for the first new student; USD 1,500 for the second child; USD 1,000 for any additional children.
- Annual re-enrollment deposit (non-refundable, applied toward tuition): USD 2,000 per student.


Tuition payment schedule and payment terms (dates shown are the stated due dates for the 2026–2027 cycle)
- Option 1: Payment of tuition in full by June 5, 2026.
- Option 2: Two installments — 60% of the annual tuition due by June 5, 2026, and the remaining 40% due by November 5, 2026. Example amounts by grade under Option 2:
- Half-Day Preschool: 60% = USD 17,700; 40% = USD 11,800.
- Preschool & K: 60% = USD 22,128; 40% = USD 14,752.
- Lower School: 60% = USD 24,462; 40% = USD 16,308.
- Middle School: 60% = USD 25,800; 40% = USD 17,200.
- Upper School: 60% = USD 30,756; 40% = USD 20,504.
- Option 3: Ten monthly installments (June 2026 through March 2027). Monthly payment examples (annual tuition divided by 10) plus a yearly flat administrative fee of USD 40 billed by Veracross:
- Half-Day Preschool: USD 2,950 per month (plus USD 40 annual Veracross fee).
- Preschool & K: USD 3,688 per month (plus USD 40 annual Veracross fee).
- Lower School: USD 4,077 per month (plus USD 40 annual Veracross fee).
- Middle School: USD 4,300 per month (plus USD 40 annual Veracross fee).
- Upper School: USD 5,126 per month (plus USD 40 annual Veracross fee).
- All matriculation fees, re-enrollment deposits, and tuition payments are completed through the school's Veracross billing system. Methods of payment accepted include checking/savings accounts drawn on a U.S. bank, wire transfer, and credit cards.


Additional and recurring charges (typical items billed separately or based on participation)
- Textbooks / media (Grades 6–12) and examination fees (Grades 11–12) are billed separately. Typical estimates: Grades 6–10 average ~USD 350 per year; Grades 11–12 (French Baccalaureate) ~USD 500 per year; International Baccalaureate fees up to ~USD 1,000 covering two years.
- Examination fee estimates: Grade 11 (French program) registration ~USD 280; Grade 12 (French program) registration ~USD 340 plus ~USD 270 for the Baccalauréat Français International (BFI); Grade 12 (IB DP) ~USD 750 total.
- Global Learning Program (overnight and curriculum trips) anticipated fees (cover transportation and accommodations when applicable): Grades 1–2: USD 300; Grades 3–4: USD 500; Grade 5: USD 1,200; Grades 6–8: USD 1,000. Grade 9 and Grade 12 GLP costs are covered by the school; Grades 10–11 GLP fee: USD 400.
- Extended day / after-school: Garderie (TPS through Grade 5) USD 14.00 per hour; Middle School study hall USD 15.00 per hour or an annual flat fee of USD 900.
- Extracurricular activities and overnight trips are billed based on participation; Upper School varsity teams carry no participation cost.
- Private ISB bus service and the hot lunch program are optional and billed upon participation. The hot lunch program is provided by an external catering company and is billed separately.


Boarding / homestay (where offered by the school)
- ISB Housing Program (host-family room and board, supervised by ISB) for Upper School international and domestic students: USD 25,000 for room and board from August 25, 2026 to June 30, 2027. This fee includes day field trips, the ISB lunch program, a monthly public transportation pass, the yearbook, and, if applicable, the new student orientation program in August.


Uniforms and other school supplies
- Preschool (Pre-K, Mid-K) and Kindergarten: supplies included in the listed tuition.
- Lower School: all supplies included in the listed tuition.
- Textbooks and media for Grades 6–12 are billed separately (see textbook estimates above). Uniform costs (where applicable) and personal supplies vary and are generally family-paid; extracurricular equipment, travel clothing, and optional program materials are billed separately when required.


Refunds and non-refundable items
- The matriculation fee is one-time and non-refundable.
- The annual re-enrollment deposit is non-refundable but is applied toward tuition.
- Other refund specifics for tuition installments or program fees are not listed in the school's tuition summary document; the only explicitly stated non-refundable items are the matriculation fee and the re-enrollment deposit.


Fee payment channels and administrative notes
- All matriculation fees, re-enrollment deposits, and tuition payments are processed through Veracross.
- Accepted payment methods: checking/savings account drawn on a U.S. bank, wire transfer, or credit card.
- The ten-month payment plan carries a yearly flat administrative fee of USD 40 billed via Veracross.
Academics

International School of Boston teaches IB (MYP), IB (DP), Bespoke Curriculum, French Curriculum for students aged 2 to 18.

Curriculum

ISB is a bilingual French-English school. From Maternelle through Upper School, the curriculum offers two internationally recognized diplomas: the French Baccalaureate or the International Baccalaureate (IB) taught in English. The Elementary/Maternelle program teaches in French and English; in Maternelle the French Ministry of Education curriculum is combined with Massachusetts Common Core Preschool and Kindergarten standards; Lower School has accreditation from the French Ministry of Education. In Middle School, classes are taught in French and English, with options to emphasize either language and to pursue IB or French Baccalaureate tracks. In Upper School, students choose between the French Baccalaureate or IB, with additional language options including Spanish, German, and Mandarin.

Higher Education Progression

ISB's College Counseling Office supports students with higher education planning across the United States, Canada, the United Kingdom, France, Ireland, Spain, the Netherlands, Germany, Switzerland, and parts of the Middle East and Asia. ISB students matriculate to many of the nation's and the world's top colleges and universities, with geographically diverse matriculation the most in New England.
Wellbeing

Social and Emotional Learning (SEL)

Learning is a dynamic and holistic process that develops social-emotional skills, study skills, and learning habits.

English as an Additional Language (EAL)

The school teaches bilingual instruction in English and French; Preschool through Kindergarten explore both languages, and Middle School courses are offered in French or English with schedules that emphasize one language to support bilingual proficiency.

Mental Wellbeing

Mental wellbeing is embedded in the school's mission and culture, with emphasis on empathy, respect, open-mindedness, and resilience; inclusive community and service activities further support student wellbeing.
Parent Experience

History

ISB began in 1962 as a French bilingual kindergarten in a house basement and quickly expanded into a bilingual elementary school. In 1983, the school moved to the Parmenter School building in Arlington. A Middle School opened in 1997 in the Almshouse in Cambridge through a partnership with the Archdiocese of Boston, and the Upper School began in 1999, with the first graduating class earning the French Baccalaureate in 2001. ISB purchased the Almshouse in 2005, and in 2019 expanded Cambridge's campus footprint to include Maternelle, previously located in Arlington, through a long-term lease with the Archdiocese of Boston. Since 2005 the historic building at 45 Matignon Road in Cambridge has been ISB's campus home.

Community

ISB serves nearly 600 students from more than 425 families, reflecting a diverse, global community. Community is central to ISB's identity, with families connected through bilingual, international education, traditions, and relationships that make ISB a sense of home. The school's community highlights include the OneISB Parent Network, school-wide Events & Traditions, and connections to Boston's French cultural networks, enriching the bilingual environment for families. ISB's community fosters engagement across divisions and backgrounds through parent involvement and partnerships within Boston's Francophone landscape.

Parent Teacher Association (PTA)

OneISB Parent Network, ISB's parent association, aims to build a sense of community among ISB's nearly 800 parents. The network operates on three pillars—Community Events, Parent Connect, and Volunteer Opportunities—to keep families connected, informed, and involved throughout the year. Volunteer opportunities span weekly Bread Sales (a school tradition supporting OneISB events), the Gala Planning Committee (a major fundraiser for the Annual Fund), and the Spring International Picnic Planning Committee, among others. Additional roles include handling the Best of Boston Guide for relocating families, Admissions Ambassador activities, and room parent support across divisions. ISB provides contact channels and details for involvement through the network's dedicated pages and staff contacts.
Facilities

Facilities Overview

An historic Cambridge campus anchors the International School of Boston's facilities. The campus features dedicated Libraries for each division, a large gymnasium and a Media Center, two playgrounds, shared outdoor athletic fields, and dedicated spaces for the visual and performing arts. The Media Center for Middle & Upper Schools is on the 4th floor of Building 3, the Lower School Library is on the 1st floor of Building 3, and the Maternelle Library is in Building 4. Middle School science labs support hands‑on learning as part of a bilingual program. The campus is accessible by foot or bike, with MBTA stops and school transportation options nearby.

Sports Facilities

ISB has a large gymnasium on campus used by students across divisions. There are shared outdoor athletic fields available for team practices and games. ISB offers interscholastic teams in soccer and volleyball in the fall, fencing and basketball in the winter, and volleyball and ultimate frisbee in the spring, for both Middle and Upper School students. Club sports provide exposure to additional activities including archery, badminton, fencing, flag football, indoor soccer, running, table tennis, and more. Through a partnership with AEFE, students compete in AEFE‑sponsored tournaments in volleyball, basketball, and soccer.

Academic Facilities

ISB provides three on‑campus libraries to support academic work: the Media Center for Middle & Upper School on Building 3's 4th floor, the Lower School Library on Building 3's 1st floor, and the Maternelle Library in Building 4. Middle School science classes include regular time in the school's science labs for hands‑on activities. Middle School language of instruction is bilingual, with classes taught in French or English. The libraries offer Follett Destiny catalog, ebooks through Sora, and Gale databases including The Boston Globe and The New York Times. There are dedicated spaces for the visual and performing arts to support academic and creative work.

Extra Curricular Facilities

Preschool through Grade 5 participate in seasonal arts clubs such as Charcoal Drawing, Dance, Digital Arts, Discovery of Music, and Violin/Viola Ensemble, with Open Chorus and private music lessons available. Middle School offers Drama Club and Rock Band, plus seasonal clubs in Photography, Digital Art, Makerspace/Crochet, and Guitar. Upper School provides opportunities in Rock Band, Theater, and Studio Art, with continued access to private lessons. ISB Radio, a web‑based program launched in 2021, gives students a platform to produce content, practice language skills, and share projects. Arts events and traditions include Arts & Design Night and the MaMA (Maternelle Museum of Art).
Extra-Curricular Activities

Academic & Intellectual

Career exploration is available through the Grade 10 Work Observation Program, and an Upper School Career Fair connects students with parents and alumni to explore paths after high school. The Global Learning Program provides travel opportunities via Academic Exchange Programs and Culture & Curriculum Trips. Student-led clubs span many subjects, including Ambassadors, Advanced German, Astronomy, BioBuilder, Chess, Creative Writing, Film, Finance, Model UN, and more. Weekly Assembly and the Student Council support leadership development and community engagement beyond the classroom.

Arts & Creative

Art is introduced across all grades through age-appropriate visual and performing arts courses, with seasonal or year-long clubs and private lessons in Visual and Performing Arts. Middle School offers Drama Club, Rock Band, French Theater Company, and Studio Art. Performance & Club opportunities for Preschool–Grade 5 include Seasonal Clubs and Open Chorus, with private music lessons available. Arts events include Arts & Design Night, MaMA (Musée d'Art de la Maternelle), and the Grade 12 Art Exhibition as part of IB Visual Arts.

Cultural & Language

The Global Learning Program is the cornerstone of student life, combining local, national, and international experiences and strengthening language skills. Travel opportunities fall into Curriculum & Culture trips, Academic Exchanges, and AEFE Partnerships. AEFE Partnerships enable participation in AEFE-sponsored tournaments and events, and ISB hosts AEFE events. Middle School SEP topics include Japanese Culture, and language-focused clubs such as Advanced German are offered.

Social & Hobbies

ISB Middle School offers after-school clubs and athletics, expanding opportunities for social and intellectual engagement. Clubs include Archery, Art, Chess, Chorus and Select Singers, Jazz/Rock Band, Model United Nations, Movie Making, Private Music Lessons, Sailing, Soccer, Tennis, Ultimate Frisbee, Yearbook, and more. Clubs run after school Monday through Friday, with some Saturday options, and are supervised by ISB faculty or approved partners. Interscholastic and club sports are offered across fall, winter, and spring.

Community & Service

Upper School has an active Community Service Club that engages with the local community through service projects and fundraising. IB students participate in service-learning and partner with organizations such as Groundwork Somerville, Alewife Biodiversity and Pollinator Garden, Mystic River Watershed Association, Food for Free, Food Link, and Cradles to Crayons. Middle School's Community Service Day involves students and faculty delivering services to the community, with projects and presentations about partner organizations.

Leadership & Professional

Upper School features a Student Council with student-elected officers. Grade 10 offers a Work Observation Program and an Upper School Career Fair to help students explore futures. ISB encourages student leadership through a wide range of student-led clubs, created by students and supported by faculty. Clubs include Ambassadors, Advanced German, Model UN, and other leadership-focused activities.

Lifestyle & Wellbeing

The athletics program promotes sportsmanship, competition, physical fitness, and lifelong wellness. Upper and Middle School students participate in interscholastic teams and club sports across fall, winter, and spring, including soccer, basketball, fencing, volleyball, and more. Club sports provide exposure to new activities in a non-competitive environment. Traditions such as the Cambridge Cup and International Cup highlight ISB's athletic culture.
Languages

Language Provision

ISB teaches French and English as core languages across all grades; Spanish, German, and Mandarin are available as electives. In Maternelle, about 75% of the day is in French, with English interwoven. Lower School is accredited by the French Ministry of Education. In Middle School, classes are taught in French and English, with options to emphasize one language and to add Spanish, German, or Mandarin; Upper School offers the French Baccalaureate or the IB Diploma, with continued access to Spanish, German, or Mandarin alongside French.

Bilingual Teaching

ISB provides bilingual instruction in French and English across all grade levels. Maternelle and Lower School teach in both languages, with Lower School holding accreditation from the French Ministry of Education. In Middle School, classes are taught in French and English, with students able to emphasize one language and to add Spanish, German, or Mandarin. In Upper School, students may pursue the French Baccalaureate or the International Baccalaureate (IB), with additional language study in Spanish, German, or Mandarin alongside French.

Immersion Programs

ISB uses a bilingual immersion model from Maternelle through Upper School. Maternelle has about 75% of the day taught in French. Lower School maintains bilingual instruction in French and English and is accredited by the French Ministry of Education. Middle School and Upper School continue bilingual delivery, with options to add Spanish, German, or Mandarin.
Reputation

Accreditations

CIS; NAIS; NEASC; IB; AISNE; AFSA; HDMFS; MLF; AEFE
Admissions

Admissions

ISB has four steps in its admissions process: Inquire, Visit, Apply, Enroll. Step 1 Inquire: complete a brief inquiry form to join the mailing list and hear about upcoming ISB events. Step 2 Visit: ISB offers campus tours, on-campus and virtual Open House events, Secondary School Shadow Days, and virtual campus visits; local families are encouraged to participate in on-campus programming. Step 3 Apply: applications are submitted online through Ravenna with no application fee; priority review is given to applications received by January 15; siblings of current students receive priority if their application is submitted by December 15; January 15 is the application deadline for priority review and the financial aid deadline. Step 4 Enroll: decisions are released by March 10; enrollment confirmations are due by April 10; ISB accepts applications year-round depending on space and student qualifications; applicants admitted after April 10 will have one week to respond to an offer of admission. Application materials vary by grade (Preschool & Kindergarten, Lower School, Middle School, Upper School) with language considerations and testing requirements as described.

Scholarships

ISB offers financial aid based on demonstrated need. The financial aid application is separate from the admission application and uses Clarity; deadlines are returning families December 15, 2025 and new families January 15, 2026. Awards are grants (not loans) and are based on demonstrated need and available funding; awards may cover tuition and other costs such as books, transportation, clubs, and exam fees. Returning families' aid is typically released with reenrollment in February 2026; new families' aid is released with the admissions decision and enrollment contract on March 10, 2026. Financial aid awards are renewable with annual reapplication. Financial aid is not available for students requiring an I-20 or who participate in ISB's homestay program. ISB may offer French government scholarships (Bourses Scolaires Françaises) for eligible French citizens, and the ISB Financial Aid Program may supplement government funding. The school also offers a ten-month payment plan for families in the financial aid program.
School Events
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