Greater Boston League
The Greater Boston League is a high school athletic conference in District 5 of the Massachusetts Interscholastic Athletic Association. The league originally included teams from the cities and towns of Arlington, Cambridge, Everett, Malden, Medford, Peabody, Revere, Somerville, and Waltham. Teams continued to leave for different leagues until only those of Everett, Malden, Medford, and Somerville were left in 2017. The league disbanded that year and the remaining members joined the Northeastern Conference. The GBL reformed in 2019. The four members that remained in the GBL in 2017 rejoined the league with the addition of Revere.
Schools
The following schools are current members of the Greater Boston League.| School | Location | Colors | Enrollment | Nickname |
| Chelsea High School | Chelsea, Massachusetts | 1611 | Red Devils | |
| Everett High School | Everett, Massachusetts | 1961 | Crimson Tide | |
| Lynn Classical High School | Lynn, Massachusetts | 1658 | Rams | |
| Lynn English High School | Lynn, Massachusetts | 2176 | Bulldogs | |
| Malden High School | Malden, Massachusetts | 1856 | Golden Tornados | |
| Medford High School | Medford, Massachusetts | 1256 | Mustangs | |
| Revere High School | Revere, Massachusetts | 2084 | Patriots | |
| Somerville High School | Somerville, Massachusetts | 1310 | Highlanders |