| Leonard Blanchard Chandler | |
| Office: | Delegate to the 1917 Massachusetts Constitutional Convention Representing the 23rd Middlesex District of the Massachusetts House of Representatives. |
| Term Start: | June 6, 1917 |
| Term End: | August 13, 1919 |
| Office2: | Twelfth Mayor of Somerville, Massachusetts |
| Term Start2: | January 4, 1904 |
| Term End2: | January 1, 1906 |
| Office3: | Member of the Massachusetts Senate Third Middlesex District |
| Term Start3: | 1902 |
| Term End3: | 1903 |
| Predecessor3: | Franklin E. Huntress |
| Office4: | Member of the Massachusetts House of Representatives 8th Middlesex District |
| Term Start4: | 1897 |
| Term End4: | 1899 |
| Office5: | Member of the Somerville, Massachusetts Board of Aldermen Ward Three |
| Birth Date: | August 29, 1851 |
| Birth Place: | Princeton, Massachusetts |
| Death Date: | November 9, 1927 (aged 76) |
| Death Place: | Somerville, Massachusetts |
| Nationality: | American |
| Party: | Republican |
| Spouse: | Hattie Betsey Stuart, married on October 22, 1874. |
| Residence: | 45 Jaques St, Somerville, Massachusetts |
| Occupation: | Milk Distributor |
Leonard Blanchard Chandler (August 29, 1851 – November 9, 1927) was a Massachusetts businessman and politician who served in the 1917 Massachusetts Constitutional Convention, in both branches of the Massachusetts legislature, both branches of the city council and as the twelfth Mayor of Somerville, Massachusetts.
Chandler as born August 29, 1851, to Leonard and Sarah (Blanchard) Chandler in Princeton, Massachusetts.
Chandler married Hattie Betsey Stewart of Charlestown, Massachusetts in Princeton, Massachusetts, on October 22, 1874. They had three children.
In 1916 the Massachusetts legislature and electorate approved a calling of a Constitutional Convention. In May 1917, Chandler was elected to serve as a member of the Massachusetts Constitutional Convention of 1917, representing the 23rd Middlesex District of the Massachusetts House of Representatives.