Montgomery Blair | |
|---|---|
 Blair, c. 1855-1865 | |
| 20th United States Postmaster General | |
| In office March 5, 1861 – September 24, 1864 | |
| President | Abraham Lincoln |
| Preceded by | Horatio King |
| Succeeded by | William Dennison |
| Personal details | |
| Born | May 10, 1813 Franklin County, Kentucky, U.S. |
| Died | July 27, 1883 (aged 70) Silver Spring, Maryland, U.S. |
| Resting place | Rock Creek Cemetery Washington, D.C., U.S. |
| Political party | Democratic (Before 1854; 1865–1883) Republican (1854–1865) |
| Spouse(s) |
Caroline Buckner
(m. 1836; died 1844)Mary Woodbury |
| Children | 4 |
| Parent |
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| Relatives |
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| Education | United States Military Academy (BS) Transylvania University (LLB) |
| Signature | .png){kind=small} |
| Military service | |
| Allegiance |  United States |
| Branch/service |  United States Army |
| Years of service | 1835–1836 |
| Rank | Second Lieutenant |
| Battles/wars | Seminole Wars |
Montgomery Blair (May 10, 1813 – July 27, 1883) was an American politician and lawyer from Maryland. He served in the Lincoln administration cabinet as Postmaster-General from 1861 to 1864, during the Civil War. He was the son of Francis Preston Blair, elder brother of Francis Preston Blair Jr. and cousin of B. Gratz Brown.