Théobald Dillon (1745, Dublin – 1792, near Lille) is count of Dillon and an Irish-born general in the French army.

He is the grandson of Arthur Dillon, the nephew of the bishop Arthur Richard Dillon and the cousin of general Arthur Dillon (who also has a brother named Theobald).

He enters Dillon's Regiment as a cadet in 1761, gradually rises to be lieutenant-colonel (1780), takes part in the Capture of Grenada (1779) and the siege of Savannah in 1779, is appointed a knight of St. Louis in 1781, is authorized to wear the Order of Cincinnatus in 1785, and is awarded a pension of fifteen hundred francs in 1786.

He becomes brigadier-general in 1791.