| George Oliver Brastow | |
| Office: | Member of the Massachusetts Governor's Council Sixth Councilor District |
| Term Start: | 1874 |
| Term End: | 1876 |
| Term Start2: | January 1, 1872 |
| Term End2: | January 5, 1874 |
| Predecessor2: | Board of Selectmen |
| Successor2: | William H. Furber |
| Term Start3: | 1869 |
| Term End3: | 1869 |
| Predecessor3: | Robert C. Pitman |
| Successor3: | Horace H. Coolidge |
| Term Start4: | 1868 |
| Term End4: | 1868 |
| Office5: | Member of the Massachusetts Senate Second Middlesex District |
| Term Start5: | 1867 |
| Term End5: | 1869 |
| Successor5: | James Pierce |
| Office6: | Member of the Massachusetts Senate First Middlesex District |
| Term Start6: | 1866 |
| Term End6: | 1867 |
| Predecessor6: | Francis Childs |
| Office7: | Member of the Massachusetts Senate County of Middlesex |
| Term Start7: | 1854 |
| Term End7: | 1854 |
| Office8: | Member of the Somerville, Massachusetts Board of Selectmen |
| Term Start8: | 1867 |
| Term End8: | 1867 |
| Office9: | Member of the Somerville, Massachusetts Board of Selectmen |
| Term Start9: | 1845 |
| Term End9: | 1845 |
| Office11: | Member of the Massachusetts House of Representatives Third Middlesex District |
| Term Start11: | 1862 |
| Term End11: | 1862 |
| Predecessor11: | Columbus Taylor |
| Successor11: | Chester Guild |
| Office12: | Member of the Massachusetts House of Representatives Town of Somerville District |
| Term Start12: | 1849 |
| Term End12: | 1851 |
| Predecessor12: | Edward L. Stevens |
| Successor12: | Edward C. Purdy |
| Office13: | Member of the Somerville, Massachusetts School Committee |
| Birth Date: | September 8, 1811 |
| Birth Place: | Wrentham, Massachusetts |
| Death Date: | November 20, 1878 (aged 67) |
| Nationality: | American |
| Rank: | Major |
| Commands: | Company I – Somerville Light Infantry – Company B 5th Regiment |
George Oliver Brastow (September 8, 1811 – November 20, 1878) was a Massachusetts businessman and politician who served as a member and President of the Massachusetts Senate, as a member of the Governor's Council, and as the first Mayor of Somerville, Massachusetts.
Before the American Civil War Brastow was the Captain of Company I of the Somerville Light Infantry of the Massachusetts Volunteer Militia. Brastow commanded the company, for the three months at the beginning of the Civil War, that Company I was federalized and reconstituted as Company B of the 5th Regiment. Brastow and his regiment fought at the First Battle of Bull Run.
In 1862 Brastow was commissioned a paymaster with the rank of Major.