| Post: | Mayor |
| Body: | Somerville |
| Insignia: | Former Somerville, Ma City Seal.png |
| Insigniacaption: | Former City Seal (1872–1972) depicting George Washington |
| Incumbent: | Katjana Ballantyne |
| Incumbentsince: | January 3, 2022 |
| Seat: | Somerville City Hall |
| Termlength: | Two years |
| Formation: | 1872 |
| First: | George O. Brastow |
From 1841 until 1872 Somerville was run by the Board of Selectmen, because up to that point Somerville was still incorporated as a town. The Mayor is the current head of the municipal government in Somerville, Massachusetts.
| Mayor | Picture | Term | Party | ||
|---|---|---|---|---|---|
| 1st | George O. Brastow | January 1, 1872 – January 5, 1874 | |||
| 2nd | January 5, 1874 – January 3, 1876 | ||||
| 3rd | Austin Belknap | January 3, 1876 – January 1878 | |||
| 4th | George A. Bruce | January 1878 – 1880 | |||
| 5th | John Adams Cummings | 1881–1884 | |||
| 6th | Mark F. Burns | 1885–1888 | Republican | ||
| 7th | Charles G. Pope | 1889–1891 | Republican | ||
| 8th | William H. Hodgkins | 1892 – January 6, 1896 | Republican | ||
| 9th | Albion A. Perry | January 6, 1896 – 1898 | Citizens and Republican | ||
| 10th | George O. Proctor | 1899–1900 | Republican | ||
| 11th | Edward Glines | January, 1901 – January 4, 1904 | Republican | ||
| 12th | Leonard B. Chandler | January 4, 1904 – January 1, 1906 | Republican | ||
| 13th | January 1, 1906 – January 4, 1909 | Republican | |||
| 14th | January 4, 1909 – January 2, 1911 | Republican | |||
| 15th | January 2, 1911 – January 5, 1914 | ||||
| 16th | January 5, 1914 – January 7, 1918 | ||||
| 17th | January 7, 1918 – January 1922 | ||||
| 18th | John M. Webster | January 1922 – January 4, 1926 | |||
| 19th | Leon Martin Conwell | January 4, 1926 – January 6, 1930 | |||
| 20th | John J. Murphy | January 6, 1930 – January 1, 1934 | |||
| 21st | James E. Hagan | January 1, 1934 – January 6, 1936 | |||
| 22nd | Leslie E. Knox | January 6, 1936 – January 3, 1938 | |||
| 23rd | John M. Lynch | January 3, 1938 – January 1943 | |||
| 24th | January 1943 – January 1950 | ||||
| 25th | John M. Lynch | January 1950 – January 1954 | Democratic | ||
| 26th | William J. Donovan | January 1954 – November 24, 1959 | |||
| (Acting) | Paul M. Haley | November 24, 1959 – January 1960 | |||
| 27th | January 1960 – January 1, 1962 | ||||
| 28th | January 1, 1962 – July 17, 1967 | ||||
| (Acting) | John R. Havican | July 17, 1967[1] – January 1968 | |||
| 29th | January 1968 – January 1970 | ||||
| 30th | January 1970 – January 1978 | ||||
| 31st | January 1978 – January 1980 | ||||
| 32nd | Eugene C. Brune | January 1980 – January 1990 | |||
| 33rd | January 1, 1990 – January 5, 1999 | ||||
| (Acting) | William M. Roche | January 5, 1999 – May 20, 1999 | |||
| 34th | Dorothy Kelly Gay | May 21, 1999 – January 5, 2004 | |||
| 35th | January 5, 2004 — January 3, 2022 | ||||
| 36th | Katjana Ballantyne | January 3, 2022 |