Thomas Green Davidson (August 3, 1805 – September 11, 1883) was a Democratic U.S. Representative from Louisiana.

Shortly after Louisiana seceded from the Union in January 1861, Davidson vacated his seat.

He was admitted to the bar and commenced practice in Greensburg, Louisiana.

He served as president of the Democratic State convention in Louisiana in 1855.

He died in Springfield, Livingston Parish, Louisiana, September 11, 1883.