| Thomas Green Davidson | |
| State: | Louisiana |
| Term Start: | March 4, 1855 |
| Term End: | March 3, 1861 |
| Predecessor: | John Perkins Jr. |
| Successor: | Joseph Parkinson Newsham |
| Birth Date: | August 3, 1805 |
| Birth Place: | Coles Creek, Mississippi, U.S. |
| Death Date: | September 11, 1883 (aged 78) |
| Death Place: | Springfield, Louisiana, U.S. |
| Party: | Democratic |
| Profession: | Lawyer, Politician |
Thomas Green Davidson (August 3, 1805September 11, 1883) was a Democratic U.S. Representative from Louisiana. Shortly after Louisiana seceded from the Union in January 1861, Davidson vacated his seat.
Born at Coles Creek, Mississippi, Davidson completed preparatory studies before going on to study law. He was admitted to the bar and commenced practice in Greensburg, Louisiana. After this he was appointed register of the United States land office. He served as member of the Louisiana House of Representatives from 1833–1846.
Davidson was elected as a Democrat to the 34th, 35th, and 36th Congresses (March 4, 1855March 3, 1861). After his time in congress he resumed the practice of his profession. He served as president of the Democratic State convention in Louisiana in 1855. He served again in the Louisiana House of Representatives 1874—1878, 1880, and 1883.He died in Springfield, Livingston Parish, Louisiana, September 11, 1883. He was interred in Springfield Cemetery.