| Abbreviation | Definition |
|---|---|
| MRGS | Mt Roskill Grammar School's |
| MRHS | Mainland Regional High School |
| MRHS | Manchester Regional High School |
| MRHS | Maria Regina High School |
| MRHS | Marriotts Ridge High School |
| MRHS | Marvin Ridge High School |
| MRHS | Mascenic Regional High School |
| MRHS | Matawan Regional High School |
| MRHS | May River High School |
| MRHS | Mesa Ridge High School |
| MRHS | Mesa Ridge High School Mesa Ridge High School |
| MRHS | Minnechaug Regional High School |
| MRHS | Monadnock Regional High School |
| MRHS | Monmouth Regional High School |
| MRHS | Monmouth Roseville High School |
| MRHS | Monmouth-Roseville High School |
| MRHS | Monomoy Regional High School |
| MRHS | Montague Regional High School |
| MRHS | Morton Ranch High School |
| MRHS | Mount Rainier High School |