| Guillaume Emmanuel Guignard de Saint-Priest | |
| Birth Date: | 4 March 1776 |
| Death Date: | 29 March 1814 (aged 38) |
| Birth Place: | Constantinople, Ottoman Empire |
| Death Place: | Laon, France |
| Rank: | Major-General |
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Guillaume Emmanuel Guignard, vicomte de Saint-Priest (4 March 1776, in Constantinople29 March 1814) was a French émigré general who fought in the Russian army during the French Revolutionary Wars and the Napoleonic Wars.
He was the eldest son of prominent émigré diplomat François-Emmanuel Guignard, comte de Saint-Priest (1735–1821), one of King Louis XVI of France's last ministers, and Constance Wilhelmine de Saint-Priest.
Guillaume Emmanuel became a Major-General in the Russian army under Emperor Alexander I of Russia, and fought against the forces of Napoleon.[1] Some weeks before the Battle of Leipzig, he and his cavalry finally defeated the troops of French brigade general François Basile Azemar in the Battle of Großdrebnitz. Saint-Priest was defeated and mortally wounded during the 1814 Allied invasion of France in the Battle of Reims and died two weeks later at Laon.