| John Adams Cummings | |
| Office: | 5th Mayor of Somerville, Massachusetts |
| Term Start: | 1881 |
| Term End: | 1884 |
| Office2: | Member of the Somerville, Massachusetts Board of Aldermen Ward 4 |
| Term Start2: | January 1877 |
| Term End2: | January 1878 |
| Term Start3: | 1875 |
| Term End3: | 1876 |
| Birth Date: | January 16, 1838 |
| Death Date: | January 6, 1887 |
| Nationality: | American |
| Profession: | Printer, Newspaper publisher |
| Unit: | Sixth New Hampshire Volunteers Army of the Potomac First New Hampshire Cavalry |
John Adams Cummings (January 16, 1838 – January 6, 1887) was a Massachusetts politician who served as the fifth Mayor of Somerville, Massachusetts.
From 1872 to 1874 Cummings was the publisher of The Somerville Journal.