Commonwealth School
| Commonwealth School | |
|---|---|
| Location | |
151 Commonwealth Avenue , Massachusetts 02116 United States | |
| Information | |
| Type | |
| Motto | Uncommon community. Uncommon curiosity. Uncommon opportunity. |
| Established | 1957 |
| Founder | Charles E. Merrill, Jr. |
| CEEB code | 220222 |
| Head of School | Jennifer Borman |
| Grades | 9–12 |
| Gender | Co-educational |
| Enrollment | 163 (2025-2026) |
| Student to teacher ratio | 5:1 |
| Campus | Back Bay |
| Colors | Red and white |
| Song | "The Spacious Firmament" |
| Athletics conference | NEPSAC
|
| Mascot | Imogene the Mermaid |
| Nickname | Mermaids |
| Accreditation | New England Association of Schools and Colleges |
| Newspaper | The Chronicle Helicon (literary) |
| Tuition | $60,075 (for 2025-2026 school year) |
| Average Financial Aid Grant | $46,260 (for 2025-2026 school year) |
| Total Financial Aid Granted | $1.8M (for 2025-2026 school year) |
| Range of Financial Aid Grants | $6,900-$54,900 (for 2023-2024 school year) |
| Website | commschool.org |
Commonwealth School, often referred to simply as Commonwealth, is a private, co-educational high school of about 160 students and 35 faculty members located in the downtown Back Bay neighborhood of Boston, Massachusetts, United States. It is accredited by the New England Association of Schools and Colleges.