Eustachy
Eustachy may refer to:
- Eustachy Erazm Sanguszko, Polish general and politician
- Eustachy Sapieha, Polish nobleman, prince, politician, Minister of Foreign Affairs and deputy to the Polish parliament
- Eustachy Stanisław Sanguszko, Polish noble, conservative politician
- Eustachy Tyszkiewicz, Polish–Lithuanian noble, archaeologist and historian from the former Grand Duchy of Lithuania
- Larry Eustachy, the current head coach of The University of Southern Mississippi's men's basketball team