International School of Boston (ISB; French: Lycée International de Boston or LIB, previously École Internationale de Boston) is a bilingual co-educational TPS-12 private school in Cambridge, Massachusetts.

Upper School (Grades 9 to 12) $43,870. Estimated Examination Fees (Grades 11 and 12): Grade 11 French Program: $250 registration fee / Grade 12 French Program: $300 registration fee, and $220 for the Baccalauréat français international (BFI) / Grade 12 International Baccalaureate: $861 ($119 per subject, $91 for the extended essay, $46 for the theory of knowledge and $10 for the creativity, activity and service). Estimated Fees for textbooks/media (Grades 6-12): Grades 6-10 & Grades 11-12 French Program only: $300-700 per year / Grades 11-12 International Baccalaureate: up to $1,000 covering two years. Matriculation Fee per new student: $2,000 ($1,500 for the second child and $1,000 for any additional children).