Jean Baptiste Ternant (12 December 1751 Damvilliers – 15 November 1833 Paris) was a French soldier, diplomat, and was French ambassador to the United States from 1791 to 1793.
He was a lieutenant in the Royal Corps of Engineers. Beginning in 1778 at Valley Forge, he served as a subinspector in the Continental Army.
After the abolition of the monarchy, he was dismissed by the ruling Girondins from his post and was succeeded by Edmond-Charles Genet.
The Independence National Historical Park has an oil portrait, painted by Charles Willson Peale in 1781.