Francis Preston Blair, American journalist (b. 1791)
Francis Preston Blair Sr. (April 12, 1791 – October 18, 1876) was an American journalist, newspaper editor, and influential figure in national politics advising several U.S. presidents across party lines.

Blair was an early member of the Democratic Party, and a strong supporter of President Andrew Jackson, having helped him win Kentucky in the 1828 presidential election. From 1831 to 1845, Blair worked as Editor-in-Chief of the Washington Globe, which served as the primary propaganda instrument for the Democratic Party, and was largely successful. Blair was an influential advisor to President Jackson, and served prominently in a group of unofficial advisors and assistants known as the "Kitchen Cabinet".

Blair, despite being a slaveholder from Kentucky, eventually came to oppose the expansion of slavery into western territories. He supported the Free Soil Party ticket of Martin Van Buren and Charles Francis Adams Sr. in the 1848 presidential election. In 1854, in opposition to the Kansas–Nebraska Act, he left the Democratic Party and helped establish the Republican Party. Blair served as an advisor to President Abraham Lincoln during the American Civil War. In 1861, he was sent by Lincoln to offer command of a large Union army to Colonel Robert E. Lee, who declined, and instead joined the Confederacy. Blair also helped organize the Hampton Roads Conference of 1865, a failed attempt to end the war.

After the Union victory, Blair became disillusioned with Radical Reconstruction, a policy promoted by many members of the Republican Party. He eventually left the party and rejoined the Democrats. His son, Francis Preston Blair Jr., was the party's nominee for vice president on a losing ticket in the 1868 election. Blair died in 1876 at age 85.