| James Mann | |
| Birthname: | James Mann |
| State: | Louisiana |
| District: | 2nd |
| Term Start: | July 18, 1868 |
| Term End: | August 26, 1868 |
| Predecessor: | Michael Hahn (Vacant 1863–1868) |
| Successor: | Lionel A. Sheldon |
| Birth Date: | 22 June 1822 |
| Birth Place: | Gorham, Maine, U.S. |
| Death Place: | New Orleans, Louisiana, U.S. |
| Party: | Democratic |
| Service: | Union Army |
| Rank: | Major |
| Unit: | Paymaster |
| Office1: | Member of the Maine House of Representatives |
| Term Start1: | 1849 |
| Term End1: | 1850 |
| Office2: | Member of the Maine Senate |
| Term Start2: | 1851 |
| Term End2: | 1853 |
| Profession: | Politician, Treasury Agent |
James Mann (June 22, 1822, Gorham, Maine – August 26, 1868, New Orleans, Louisiana) was a 19th-century American Civil War veteran and politician.
He served in the Maine legislature and was elected as a Democrat to the United States House of Representatives from Louisiana's 2nd congressional district but died just five weeks into his term in 1868.
Mann was a member of the Maine House of Representatives (1849–50) and Maine Senate (1851–53). He was a major in the Union Army during the American Civil War, serving as a paymaster.
After the war, he remained in New Orleans as a Treasury agent.
He was elected as part of Louisiana's next congressional delegation after the state was readmitted to representation. He took his seat on July 18, 1868, and died on August 26, 1868.
The special election to succeed Mann was won by John Willis Menard, the first African American ever elected to Congress, but the House of Representatives declined to seat him.