Saint-Trojan (French pronunciation: [sɛ̃ tʁɔʒɑ̃]) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.

It is in the Blaye wine region of Bordeaux, with the Château Mercier and Vignobles Briolais vineyards located in the village.

The United States Navy established a naval air station on 14 July 1918 to operate seaplanes during World War I.

The base closed shortly after the First Armistice at Compiègne.

This Gironde geographical article is a stub.