Bourtzi ( el, Μπούρτζι, from Ottoman Turkish and Arabic wikt:برج, برج - ''burc'' meaning "tower") may refer to a number of fortresses in Greece:
* Bourtzi (Nafplio), in the port of Nafplio, the most famous of them
* Bourtzi (Aegina), on an islet off Aegina
* Bourtzi (Aulis), a ruined castle near Aulis (ancient Greece), Aulis
* Bourtzi (Poros), on an island off Poros
* Bourtzi (Chalkis), a now demolished Venetian fortress at Chalkis
* Bourtzi (Methoni), at Methoni, Messenia
* Bourtzi (Karystos), at Karystos
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